UPDATE readme

made it more errrm palatable for people outside our group

.vscode/settings.json

@@ -1,63 +0,0 @@
-{
-    "C_Cpp.default.configurationProvider": "go2sh.cmake-integration",
-    "files.associations": {
-        "cctype": "cpp",
-        "clocale": "cpp",
-        "cmath": "cpp",
-        "cstdarg": "cpp",
-        "cstddef": "cpp",
-        "cstdio": "cpp",
-        "cstdlib": "cpp",
-        "cstring": "cpp",
-        "ctime": "cpp",
-        "cwchar": "cpp",
-        "cwctype": "cpp",
-        "array": "cpp",
-        "atomic": "cpp",
-        "bit": "cpp",
-        "*.tcc": "cpp",
-        "chrono": "cpp",
-        "condition_variable": "cpp",
-        "cstdint": "cpp",
-        "deque": "cpp",
-        "list": "cpp",
-        "map": "cpp",
-        "set": "cpp",
-        "unordered_map": "cpp",
-        "unordered_set": "cpp",
-        "vector": "cpp",
-        "exception": "cpp",
-        "algorithm": "cpp",
-        "functional": "cpp",
-        "iterator": "cpp",
-        "memory": "cpp",
-        "memory_resource": "cpp",
-        "numeric": "cpp",
-        "optional": "cpp",
-        "random": "cpp",
-        "ratio": "cpp",
-        "string": "cpp",
-        "string_view": "cpp",
-        "system_error": "cpp",
-        "tuple": "cpp",
-        "type_traits": "cpp",
-        "utility": "cpp",
-        "fstream": "cpp",
-        "future": "cpp",
-        "initializer_list": "cpp",
-        "iosfwd": "cpp",
-        "iostream": "cpp",
-        "istream": "cpp",
-        "limits": "cpp",
-        "mutex": "cpp",
-        "new": "cpp",
-        "ostream": "cpp",
-        "sstream": "cpp",
-        "stdexcept": "cpp",
-        "streambuf": "cpp",
-        "thread": "cpp",
-        "cinttypes": "cpp",
-        "typeinfo": "cpp",
-        "variant": "cpp"
-    }
-}

CMakeLists.txt

@@ -3,12 +3,28 @@ project(another_studproject)
 
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_FLAGS "-O3 -flto=thin -march=native")
-add_executable(another_studproject 
+
+# Process Abseil's CMake build system
+add_subdirectory(./src/includes/3thparty/abseil-cpp
+                ./src/includes/3thparty/tsl
+                )
+
+
+add_executable(studproject 
                 ./src/includes/generator.h
                 ./src/generator.cpp
                 ./src/includes/tests.h
                 ./src/includes/aggregate_tests.h
-                main.cpp
-                
-
+                ./src/includes/3thparty/emilib/loguru.cpp
+                ./src/main.cpp
 )
+
+target_link_libraries(studproject 
+                        absl::hash 
+                        absl::node_hash_map 
+                        absl::flat_hash_map 
+                        pthread 
+                        dl
+                        stdc++fs
+)
+

README.md

@@ -0,0 +1,27 @@
+
+# Instructions
+after the project is cloned, run `git submodule update --init --recursive` to pull submodules. 
+This is stuff like abseil and other maps are git submodules that don't get downloaded automatically. 
+
+To build, just run
+`mkdir build`  
+`cd build`  
+`cmake .. -G "<Build System>"` and then whatever command the build system uses.
+For example, with unix maketools:
+
+`cmake -G "Unix makefiles"`
+`make`
+
+But if you still got the same config as the one we all used for parkmanne, you should have vscode + cmaketools plugin. In which case, just press build. 
+
+
+## Dependencies
+Install boost. (https://www.boost.org/) should just be `pacman -S mingw-w64-x86_64-boost` in the msys2 shell. If you still have the same install as the parkmanne project, you already have this installed.
+If you don't for some reason, see command above. If you don't have the same setup anymore, ask me. Stefan, it is `apt install libboost-all-dev` on ubuntu if i remember correctly. `pacman -S boost-libs` on manjaro.  
+We need it for `boost::unordered`, and i have no easy way to include it in the project.
+ 
+Also, this is only tested on linux. It *should* work on windows. I remember it working on windows, but I recently did a fresh install on windows after getting an SSD and I'm having trouble configuring clang to work for projects I was able to compile in the past.
+Assume it doesnt and compile on linux. 
+
+Also, make sure your compiler supports C++17. That should be the latest versions all major compilers (clang 5+, gcc 7+, msvc 19.14+ (Visual studio 2017+))
+We're at VS2019, clang 10 and gcc 9 now, so this shouldn't be an issue if you still got the parkmanne setup.

clang-format

@@ -0,0 +1,62 @@
+---
+BasedOnStyle: WebKit
+AccessModifierOffset: '0'
+AlignAfterOpenBracket: Align
+AlignConsecutiveMacros: 'true'
+AlignConsecutiveAssignments: 'true'
+AlignEscapedNewlines: Left
+AlignTrailingComments: 'true'
+AllowAllArgumentsOnNextLine: 'true'
+AllowAllConstructorInitializersOnNextLine: 'true'
+AllowAllParametersOfDeclarationOnNextLine: 'true'
+AllowShortBlocksOnASingleLine: 'true'
+AllowShortCaseLabelsOnASingleLine: 'true'
+AllowShortFunctionsOnASingleLine: Inline
+AllowShortIfStatementsOnASingleLine: Never
+AlwaysBreakTemplateDeclarations: 'Yes'
+BinPackArguments: 'false'
+BinPackParameters: 'false'
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Stroustrup
+BreakBeforeTernaryOperators: 'false'
+BreakConstructorInitializers: AfterColon
+BreakInheritanceList: AfterColon
+BreakStringLiterals: 'true'
+ColumnLimit: '100'
+CompactNamespaces: 'true'
+ConstructorInitializerAllOnOneLineOrOnePerLine: 'true'
+ConstructorInitializerIndentWidth: '4'
+ContinuationIndentWidth: '4'
+Cpp11BracedListStyle: 'true'
+DerivePointerAlignment: 'false'
+DisableFormat: 'false'
+FixNamespaceComments: 'true'
+IncludeBlocks: Merge
+IndentCaseLabels: 'true'
+IndentWidth: '4'
+IndentWrappedFunctionNames: 'false'
+KeepEmptyLinesAtTheStartOfBlocks: 'true'
+Language: Cpp
+NamespaceIndentation: None
+PointerAlignment: Left
+ReflowComments: 'true'
+SortIncludes: 'true'
+SortUsingDeclarations: 'true'
+SpaceAfterCStyleCast: 'true'
+SpaceAfterLogicalNot: 'false'
+SpaceAfterTemplateKeyword: 'false'
+SpaceBeforeAssignmentOperators: 'true'
+SpaceBeforeCpp11BracedList: 'true'
+SpaceBeforeCtorInitializerColon: 'false'
+SpaceBeforeInheritanceColon: 'false'
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: 'true'
+SpacesInAngles: 'false'
+SpacesInCStyleCastParentheses: 'false'
+SpacesInContainerLiterals: 'false'
+SpacesInParentheses: 'false'
+SpacesInSquareBrackets: 'false'
+Standard: Cpp11
+UseTab: ForContinuationAndIndentation
+
+...

main.cpp

@@ -1,53 +0,0 @@
-#include <iostream>
-#include <unordered_map>
-#include <functional>
-#include <fstream>
-// #include <sparsehash/sparse_hash_map>
-
-#include "./src/includes/aggregate_tests.h"
-
-
-
-
-// typedef google::sparse_hash_map<int, int> intmap;
-// typedef google::sparse_hash_map<std::string,std::string> stringmap
-typedef std::unordered_map<int, int> intmap;
-typedef std::unordered_map<string, string> stringmap;
-// we can use ^ to switch the map implementations to that
-// we can add some cli handling so we can specify which maps to tests (or all)
-int main() {
-    time_point<steady_clock> start_test = steady_clock::now();
-    // string_test(stringmap{}, 1); // process gets killed for sizes >35000
-    int_test_aggregate(intmap{}, 30);
-    string_test_aggregate(stringmap{}, 30);
-    time_point<steady_clock> end_test = steady_clock::now();
-    std::cout << "\n\n 30 runs for all tests for 1 map: " << duration_cast<seconds>(end_test-start_test).count() << " seconds\n\n";
-    
-    // test takes 52 mins for 10 runs for one hashmap
-    // so it'll take ~3 hours per map if we want 30 runs per test
-    /* if the other maps have about the same operation times ************
-
-    // maps to benchmark:
-    1. Google dense_hash_map
-    2. Google sparse_hash_map
-    3. folly F14ValueMap
-    4. folly F14NodeMap
-    5. Tessil/ordered-map
-    6. Tessil/array-hash
-    7. Tessil/hopscotch-map
-    8. Tessil/sparse-map/
-    9. abseil node_hash_map
-    10. abseil flat_hash_map
-    11. Glib GHashTable
-    12. Boost unordered_map
-    13. Qt QHash
-    14. skarupke/flat_hash_map
-    15. greg7mdp/sparsepp
-    16. greg7mdp /parallel-hashmap  (phmap::flat_hash_map and phmap::node_hash_map)
-    17. emilk/emilib emilib::hashmap
-    18. martinus robin_hood::unordered_node_map
-    19. martinus/robin-hood-hashing/
-    20. skarupke /flat_hash_map 
-    */
-    
-}

src/clang-format

@@ -0,0 +1,62 @@
+---
+BasedOnStyle: WebKit
+AccessModifierOffset: '0'
+AlignAfterOpenBracket: Align
+AlignConsecutiveMacros: 'true'
+AlignConsecutiveAssignments: 'true'
+AlignEscapedNewlines: Left
+AlignTrailingComments: 'true'
+AllowAllArgumentsOnNextLine: 'true'
+AllowAllConstructorInitializersOnNextLine: 'true'
+AllowAllParametersOfDeclarationOnNextLine: 'true'
+AllowShortBlocksOnASingleLine: 'true'
+AllowShortCaseLabelsOnASingleLine: 'true'
+AllowShortFunctionsOnASingleLine: Inline
+AllowShortIfStatementsOnASingleLine: Never
+AlwaysBreakTemplateDeclarations: 'Yes'
+BinPackArguments: 'false'
+BinPackParameters: 'false'
+BreakBeforeBinaryOperators: None
+BreakBeforeBraces: Stroustrup
+BreakBeforeTernaryOperators: 'false'
+BreakConstructorInitializers: AfterColon
+BreakInheritanceList: AfterColon
+BreakStringLiterals: 'true'
+ColumnLimit: '100'
+CompactNamespaces: 'true'
+ConstructorInitializerAllOnOneLineOrOnePerLine: 'true'
+ConstructorInitializerIndentWidth: '4'
+ContinuationIndentWidth: '4'
+Cpp11BracedListStyle: 'true'
+DerivePointerAlignment: 'false'
+DisableFormat: 'false'
+FixNamespaceComments: 'true'
+IncludeBlocks: Merge
+IndentCaseLabels: 'true'
+IndentWidth: '4'
+IndentWrappedFunctionNames: 'false'
+KeepEmptyLinesAtTheStartOfBlocks: 'true'
+Language: Cpp
+NamespaceIndentation: None
+PointerAlignment: Left
+ReflowComments: 'true'
+SortIncludes: 'true'
+SortUsingDeclarations: 'true'
+SpaceAfterCStyleCast: 'true'
+SpaceAfterLogicalNot: 'false'
+SpaceAfterTemplateKeyword: 'false'
+SpaceBeforeAssignmentOperators: 'true'
+SpaceBeforeCpp11BracedList: 'true'
+SpaceBeforeCtorInitializerColon: 'false'
+SpaceBeforeInheritanceColon: 'false'
+SpaceBeforeParens: ControlStatements
+SpaceBeforeRangeBasedForLoopColon: 'true'
+SpacesInAngles: 'false'
+SpacesInCStyleCastParentheses: 'false'
+SpacesInContainerLiterals: 'false'
+SpacesInParentheses: 'false'
+SpacesInSquareBrackets: 'false'
+Standard: Cpp11
+UseTab: ForContinuationAndIndentation
+
+...

src/generator.cpp

@@ -1,7 +1,7 @@
 
-#include "./includes/generator.h"
-
+#include "./includes/generator.h" // imports a generator to be used for the functions
 
+// generates string to be used as a key
 std::string gen_string() { // 90^size posibilities
   std::string randomstring;
     for (int i = 0; i < 5; ++i) {
@@ -9,7 +9,7 @@ std::string gen_string() { // 90^size posibilities
     }
     return randomstring;
 }
-
+// gen strings that dont exist in the hashmap
 std::string gen_unsuccesfull_string() { // 90^size posibilities
     std::string randomstring;
     for (int i = 0; i < 4; ++i) {
@@ -18,10 +18,11 @@ std::string gen_unsuccesfull_string() { // 90^size posibilities
     return randomstring;
 }
 
-int gen_int(){
+// gen integers to be used as keys
+int gen_int() {
     return insert_int(generator);
 }
-
-int gen_unsuccesfull_int(){
+//gen ints that don't exist in the hashmap
+int gen_unsuccesfull_int() {
     return noninsert_int(generator);
 }

src/includes/3thparty/abseil-cpp

@@ -0,0 +1 @@
+Subproject commit 24713a7036a81498334807fa5c7ad3cb7c643711

src/includes/3thparty/emilib/hash_map.hpp

@@ -0,0 +1,666 @@
+// By Emil Ernerfeldt 2014-2017
+// LICENSE:
+//   This software is dual-licensed to the public domain and under the following
+//   license: you are granted a perpetual, irrevocable license to copy, modify,
+//   publish, and distribute this file as you see fit.
+
+#pragma once
+
+#include <cstdlib>
+#include <iterator>
+#include <utility>
+
+#include "loguru.hpp"
+
+namespace emilib {
+
+/// like std::equal_to but no need to #include <functional>
+template<typename T>
+struct HashMapEqualTo
+{
+	constexpr bool operator()(const T& lhs, const T& rhs) const
+	{
+		return lhs == rhs;
+	}
+};
+
+/// A cache-friendly hash table with open addressing, linear probing and power-of-two capacity
+template <typename KeyT, typename ValueT, typename HashT = std::hash<KeyT>, typename EqT = HashMapEqualTo<KeyT>>
+class HashMap
+{
+private:
+	using MyType = HashMap<KeyT, ValueT, HashT, EqT>;
+
+	using PairT = std::pair<KeyT, ValueT>;
+public:
+	using size_type       = size_t;
+	using value_type      = PairT;
+	using reference       = PairT&;
+	using const_reference = const PairT&;
+
+	class iterator
+	{
+	public:
+		using iterator_category = std::forward_iterator_tag;
+		using difference_type   = size_t;
+		using distance_type     = size_t;
+		using value_type        = std::pair<KeyT, ValueT>;
+		using pointer           = value_type*;
+		using reference         = value_type&;
+
+		iterator() { }
+
+		iterator(MyType* hash_map, size_t bucket) : _map(hash_map), _bucket(bucket)
+		{
+		}
+
+		iterator& operator++()
+		{
+			this->goto_next_element();
+			return *this;
+		}
+
+		iterator operator++(int)
+		{
+			size_t old_index = _bucket;
+			this->goto_next_element();
+			return iterator(_map, old_index);
+		}
+
+		reference operator*() const
+		{
+			return _map->_pairs[_bucket];
+		}
+
+		pointer operator->() const
+		{
+			return _map->_pairs + _bucket;
+		}
+
+		bool operator==(const iterator& rhs) const
+		{
+			DCHECK_EQ_F(_map, rhs._map);
+			return this->_bucket == rhs._bucket;
+		}
+
+		bool operator!=(const iterator& rhs) const
+		{
+			DCHECK_EQ_F(_map, rhs._map);
+			return this->_bucket != rhs._bucket;
+		}
+
+	private:
+		void goto_next_element()
+		{
+			DCHECK_LT_F(_bucket, _map->_num_buckets);
+			do {
+				_bucket++;
+			} while (_bucket < _map->_num_buckets && _map->_states[_bucket] != State::FILLED);
+		}
+
+	//private:
+	//	friend class MyType;
+	public:
+		MyType* _map;
+		size_t  _bucket;
+	};
+
+	class const_iterator
+	{
+	public:
+		using iterator_category = std::forward_iterator_tag;
+		using difference_type   = size_t;
+		using distance_type     = size_t;
+		using value_type        = const std::pair<KeyT, ValueT>;
+		using pointer           = value_type*;
+		using reference         = value_type&;
+
+		const_iterator() { }
+
+		const_iterator(iterator proto) : _map(proto._map), _bucket(proto._bucket)
+		{
+		}
+
+		const_iterator(const MyType* hash_map, size_t bucket) : _map(hash_map), _bucket(bucket)
+		{
+		}
+
+		const_iterator& operator++()
+		{
+			this->goto_next_element();
+			return *this;
+		}
+
+		const_iterator operator++(int)
+		{
+			size_t old_index = _bucket;
+			this->goto_next_element();
+			return const_iterator(_map, old_index);
+		}
+
+		reference operator*() const
+		{
+			return _map->_pairs[_bucket];
+		}
+
+		pointer operator->() const
+		{
+			return _map->_pairs + _bucket;
+		}
+
+		bool operator==(const const_iterator& rhs) const
+		{
+			DCHECK_EQ_F(_map, rhs._map);
+			return this->_bucket == rhs._bucket;
+		}
+
+		bool operator!=(const const_iterator& rhs) const
+		{
+			DCHECK_EQ_F(_map, rhs._map);
+			return this->_bucket != rhs._bucket;
+		}
+
+	private:
+		void goto_next_element()
+		{
+			DCHECK_LT_F(_bucket, _map->_num_buckets);
+			do {
+				_bucket++;
+			} while (_bucket < _map->_num_buckets && _map->_states[_bucket] != State::FILLED);
+		}
+
+	//private:
+	//	friend class MyType;
+	public:
+		const MyType* _map;
+		size_t        _bucket;
+	};
+
+	// ------------------------------------------------------------------------
+
+	HashMap() = default;
+
+	HashMap(const HashMap& other)
+	{
+		reserve(other.size());
+		insert(other.cbegin(), other.cend());
+	}
+
+	HashMap(HashMap&& other)
+	{
+		*this = std::move(other);
+	}
+
+	HashMap& operator=(const HashMap& other)
+	{
+		clear();
+		reserve(other.size());
+		insert(other.cbegin(), other.cend());
+		return *this;
+	}
+
+	void operator=(HashMap&& other)
+	{
+		this->swap(other);
+	}
+
+	~HashMap()
+	{
+		for (size_t bucket=0; bucket<_num_buckets; ++bucket) {
+			if (_states[bucket] == State::FILLED) {
+				_pairs[bucket].~PairT();
+			}
+		}
+		free(_states);
+		free(_pairs);
+	}
+
+	void swap(HashMap& other)
+	{
+		std::swap(_hasher,           other._hasher);
+		std::swap(_eq,               other._eq);
+		std::swap(_states,           other._states);
+		std::swap(_pairs,            other._pairs);
+		std::swap(_num_buckets,      other._num_buckets);
+		std::swap(_num_filled,       other._num_filled);
+		std::swap(_max_probe_length, other._max_probe_length);
+		std::swap(_mask,             other._mask);
+	}
+
+	// -------------------------------------------------------------
+
+	iterator begin()
+	{
+		size_t bucket = 0;
+		while (bucket<_num_buckets && _states[bucket] != State::FILLED) {
+			++bucket;
+		}
+		return iterator(this, bucket);
+	}
+
+	const_iterator cbegin() const
+	{
+		size_t bucket = 0;
+		while (bucket<_num_buckets && _states[bucket] != State::FILLED) {
+			++bucket;
+		}
+		return const_iterator(this, bucket);
+	}
+
+	const_iterator begin() const
+	{
+		return cbegin();
+	}
+
+	iterator end()
+	{
+		return iterator(this, _num_buckets);
+	}
+
+	const_iterator cend() const
+	{
+		return const_iterator(this, _num_buckets);
+	}
+
+	const_iterator end() const
+	{
+		return cend();
+	}
+
+	size_t size() const
+	{
+		return _num_filled;
+	}
+
+	bool empty() const
+	{
+		return _num_filled==0;
+	}
+
+	// Returns the number of buckets.
+	size_t bucket_count() const
+	{
+		return _num_buckets;
+	}
+
+	/// Returns average number of elements per bucket.
+	float load_factor() const
+	{
+		return static_cast<float>(_num_filled) / static_cast<float>(_num_buckets);
+	}
+
+	// ------------------------------------------------------------
+
+	template<typename KeyLike>
+	iterator find(const KeyLike& key)
+	{
+		auto bucket = this->find_filled_bucket(key);
+		if (bucket == (size_t)-1) {
+			return this->end();
+		}
+		return iterator(this, bucket);
+	}
+
+	template<typename KeyLike>
+	const_iterator find(const KeyLike& key) const
+	{
+		auto bucket = this->find_filled_bucket(key);
+		if (bucket == (size_t)-1)
+		{
+			return this->end();
+		}
+		return const_iterator(this, bucket);
+	}
+
+	template<typename KeyLike>
+	bool contains(const KeyLike& k) const
+	{
+		return find_filled_bucket(k) != (size_t)-1;
+	}
+
+	template<typename KeyLike>
+	size_t count(const KeyLike& k) const
+	{
+		return find_filled_bucket(k) != (size_t)-1 ? 1 : 0;
+	}
+
+	/// Returns the matching ValueT or nullptr if k isn't found.
+	template<typename KeyLike>
+	ValueT* try_get(const KeyLike& k)
+	{
+		auto bucket = find_filled_bucket(k);
+		if (bucket != (size_t)-1) {
+			return &_pairs[bucket].second;
+		} else {
+			return nullptr;
+		}
+	}
+
+	/// Const version of the above
+	template<typename KeyLike>
+	const ValueT* try_get(const KeyLike& k) const
+	{
+		auto bucket = find_filled_bucket(k);
+		if (bucket != (size_t)-1) {
+			return &_pairs[bucket].second;
+		} else {
+			return nullptr;
+		}
+	}
+
+	/// Convenience function.
+	template<typename KeyLike>
+	const ValueT get_or_return_default(const KeyLike& k) const
+	{
+		const ValueT* ret = try_get(k);
+		if (ret) {
+			return *ret;
+		} else {
+			return ValueT();
+		}
+	}
+
+	// -----------------------------------------------------
+
+	/// Returns a pair consisting of an iterator to the inserted element
+	/// (or to the element that prevented the insertion)
+	/// and a bool denoting whether the insertion took place.
+	std::pair<iterator, bool> insert(const KeyT& key, const ValueT& value)
+	{
+		check_expand_need();
+
+		auto bucket = find_or_allocate(key);
+
+		if (_states[bucket] == State::FILLED) {
+			return { iterator(this, bucket), false };
+		} else {
+			_states[bucket] = State::FILLED;
+			new(_pairs + bucket) PairT(key, value);
+			_num_filled++;
+			return { iterator(this, bucket), true };
+		}
+	}
+
+	std::pair<iterator, bool> insert(const std::pair<KeyT, ValueT>& p)
+	{
+		return insert(p.first, p.second);
+	}
+
+	void insert(const_iterator begin, const_iterator end)
+	{
+		// TODO: reserve space exactly once.
+		for (; begin != end; ++begin) {
+			insert(begin->first, begin->second);
+		}
+	}
+
+	/// Same as above, but contains(key) MUST be false
+	void insert_unique(KeyT&& key, ValueT&& value)
+	{
+		DCHECK_F(!contains(key));
+		check_expand_need();
+		auto bucket = find_empty_bucket(key);
+		_states[bucket] = State::FILLED;
+		new(_pairs + bucket) PairT(std::move(key), std::move(value));
+		_num_filled++;
+	}
+
+	void insert_unique(std::pair<KeyT, ValueT>&& p)
+	{
+		insert_unique(std::move(p.first), std::move(p.second));
+	}
+
+	void insert_or_assign(const KeyT& key, ValueT&& value)
+	{
+		check_expand_need();
+
+		auto bucket = find_or_allocate(key);
+
+		// Check if inserting a new value rather than overwriting an old entry
+		if (_states[bucket] == State::FILLED) {
+			_pairs[bucket].second = value;
+		} else {
+			_states[bucket] = State::FILLED;
+			new(_pairs + bucket) PairT(key, value);
+			_num_filled++;
+		}
+	}
+
+	/// Return the old value or ValueT() if it didn't exist.
+	ValueT set_get(const KeyT& key, const ValueT& new_value)
+	{
+		check_expand_need();
+
+		auto bucket = find_or_allocate(key);
+
+		// Check if inserting a new value rather than overwriting an old entry
+		if (_states[bucket] == State::FILLED) {
+			ValueT old_value = _pairs[bucket].second;
+			_pairs[bucket] = new_value.second;
+			return old_value;
+		} else {
+			_states[bucket] = State::FILLED;
+			new(_pairs + bucket) PairT(key, new_value);
+			_num_filled++;
+			return ValueT();
+		}
+	}
+
+	/// Like std::map<KeyT,ValueT>::operator[].
+	ValueT& operator[](const KeyT& key)
+	{
+		check_expand_need();
+
+		auto bucket = find_or_allocate(key);
+
+		/* Check if inserting a new value rather than overwriting an old entry */
+		if (_states[bucket] != State::FILLED) {
+			_states[bucket] = State::FILLED;
+			new(_pairs + bucket) PairT(key, ValueT());
+			_num_filled++;
+		}
+
+		return _pairs[bucket].second;
+	}
+
+	// -------------------------------------------------------
+
+	/// Erase an element from the hash table.
+	/// return false if element was not found
+	bool erase(const KeyT& key)
+	{
+		auto bucket = find_filled_bucket(key);
+		if (bucket != (size_t)-1) {
+			_states[bucket] = State::ACTIVE;
+			_pairs[bucket].~PairT();
+			_num_filled -= 1;
+			return true;
+		} else {
+			return false;
+		}
+	}
+
+	/// Erase an element using an iterator.
+	/// Returns an iterator to the next element (or end()).
+	iterator erase(iterator it)
+	{
+		DCHECK_EQ_F(it._map, this);
+		DCHECK_LT_F(it._bucket, _num_buckets);
+		_states[it._bucket] = State::ACTIVE;
+		_pairs[it._bucket].~PairT();
+		_num_filled -= 1;
+		return ++it;
+	}
+
+	/// Remove all elements, keeping full capacity.
+	void clear()
+	{
+		for (size_t bucket=0; bucket<_num_buckets; ++bucket) {
+			if (_states[bucket] == State::FILLED) {
+				_states[bucket] = State::INACTIVE;
+				_pairs[bucket].~PairT();
+			}
+		}
+		_num_filled = 0;
+		_max_probe_length = -1;
+	}
+
+	/// Make room for this many elements
+	void reserve(size_t num_elems)
+	{
+		size_t required_buckets = num_elems + num_elems/2 + 1;
+		if (required_buckets <= _num_buckets) {
+			return;
+		}
+		size_t num_buckets = 4;
+		while (num_buckets < required_buckets) { num_buckets *= 2; }
+
+		auto new_states = (State*)malloc(num_buckets * sizeof(State));
+		auto new_pairs  = (PairT*)malloc(num_buckets * sizeof(PairT));
+
+		if (!new_states || !new_pairs) {
+			free(new_states);
+			free(new_pairs);
+			throw std::bad_alloc();
+		}
+
+		//auto old_num_filled  = _num_filled;
+		auto old_num_buckets = _num_buckets;
+		auto old_states      = _states;
+		auto old_pairs       = _pairs;
+
+		_num_filled  = 0;
+		_num_buckets = num_buckets;
+		_mask        = _num_buckets - 1;
+		_states      = new_states;
+		_pairs       = new_pairs;
+
+		std::fill_n(_states, num_buckets, State::INACTIVE);
+
+		_max_probe_length = -1;
+
+		for (size_t src_bucket=0; src_bucket<old_num_buckets; src_bucket++) {
+			if (old_states[src_bucket] == State::FILLED) {
+				auto& src_pair = old_pairs[src_bucket];
+
+				auto dst_bucket = find_empty_bucket(src_pair.first);
+				DCHECK_NE_F(dst_bucket, (size_t)-1);
+				DCHECK_NE_F(_states[dst_bucket], State::FILLED);
+				_states[dst_bucket] = State::FILLED;
+				new(_pairs + dst_bucket) PairT(std::move(src_pair));
+				_num_filled += 1;
+
+				src_pair.~PairT();
+			}
+		}
+
+		//DCHECK_EQ_F(old_num_filled, _num_filled);
+
+		free(old_states);
+		free(old_pairs);
+	}
+
+private:
+	// Can we fit another element?
+	void check_expand_need()
+	{
+		reserve(_num_filled + 1);
+	}
+
+	// Find the bucket with this key, or return (size_t)-1
+	template<typename KeyLike>
+	size_t find_filled_bucket(const KeyLike& key) const
+	{
+		if (empty()) { return (size_t)-1; } // Optimization
+
+		auto hash_value = _hasher(key);
+		for (int offset=0; offset<=_max_probe_length; ++offset) {
+			auto bucket = (hash_value + offset) & _mask;
+			if (_states[bucket] == State::FILLED) {
+				if (_eq(_pairs[bucket].first, key)) {
+					return bucket;
+				}
+			} else if (_states[bucket] == State::INACTIVE) {
+				return (size_t)-1; // End of the chain!
+			}
+		}
+		return (size_t)-1;
+	}
+
+	// Find the bucket with this key, or return a good empty bucket to place the key in.
+	// In the latter case, the bucket is expected to be filled.
+	size_t find_or_allocate(const KeyT& key)
+	{
+		auto hash_value = _hasher(key);
+		size_t hole = (size_t)-1;
+		int offset=0;
+		for (; offset<=_max_probe_length; ++offset) {
+			auto bucket = (hash_value + offset) & _mask;
+
+			if (_states[bucket] == State::FILLED) {
+				if (_eq(_pairs[bucket].first, key)) {
+					return bucket;
+				}
+			} else if (_states[bucket] == State::INACTIVE) {
+				return bucket;
+			} else {
+				// ACTIVE: keep searching
+				if (hole == (size_t)-1) {
+					hole = bucket;
+				}
+			}
+		}
+
+		// No key found - but maybe a hole for it
+
+		DCHECK_EQ_F(offset, _max_probe_length+1);
+
+		if (hole != (size_t)-1) {
+			return hole;
+		}
+
+		// No hole found within _max_probe_length
+		for (; ; ++offset) {
+			auto bucket = (hash_value + offset) & _mask;
+
+			if (_states[bucket] != State::FILLED) {
+				_max_probe_length = offset;
+				return bucket;
+			}
+		}
+	}
+
+	// key is not in this map. Find a place to put it.
+	size_t find_empty_bucket(const KeyT& key)
+	{
+		auto hash_value = _hasher(key);
+		for (int offset=0; ; ++offset) {
+			auto bucket = (hash_value + offset) & _mask;
+			if (_states[bucket] != State::FILLED) {
+				if (offset > _max_probe_length) {
+					_max_probe_length = offset;
+				}
+				return bucket;
+			}
+		}
+	}
+
+private:
+	enum class State : uint8_t
+	{
+		INACTIVE, // Never been touched
+		ACTIVE,   // Is inside a search-chain, but is empty
+		FILLED    // Is set with key/value
+	};
+
+	HashT   _hasher;
+	EqT     _eq;
+	State*  _states           = nullptr;
+	PairT*  _pairs            = nullptr;
+	size_t  _num_buckets      =  0;
+	size_t  _num_filled       =  0;
+	int     _max_probe_length = -1; // Our longest bucket-brigade is this long. ONLY when we have zero elements is this ever negative (-1).
+	size_t  _mask             = 0;  // _num_buckets minus one
+};
+
+} // namespace emilib

src/includes/3thparty/parallel_hashmap/conanfile.py

@@ -0,0 +1,36 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+from conans import ConanFile, tools
+import os
+
+class SparseppConan(ConanFile):
+    name = "parallel_hashmap"
+    version = "1.27"
+    description = "A header-only, very fast and memory-friendly hash map"
+    
+    # Indicates License type of the packaged library
+    license = "https://github.com/greg7mdp/parallel-hashmap/blob/master/LICENSE"
+    
+    # Packages the license for the conanfile.py
+    exports = ["LICENSE"]
+    
+    # Custom attributes for Bincrafters recipe conventions
+    source_subfolder = "source_subfolder"
+    
+    def source(self):
+        source_url = "https://github.com/greg7mdp/parallel-hashmap"
+        tools.get("{0}/archive/{1}.tar.gz".format(source_url, self.version))
+        extracted_dir = self.name + "-" + self.version
+
+        #Rename to "source_folder" is a convention to simplify later steps
+        os.rename(extracted_dir, self.source_subfolder)
+
+
+    def package(self):
+        include_folder = os.path.join(self.source_subfolder, "parallel_hashmap")
+        self.copy(pattern="LICENSE")
+        self.copy(pattern="*", dst="include/parallel_hashmap", src=include_folder)
+
+    def package_id(self):
+        self.info.header_only()

src/includes/3thparty/parallel_hashmap/meminfo.h

@@ -0,0 +1,195 @@
+#if !defined(spp_memory_h_guard)
+#define spp_memory_h_guard
+
+#include <cstdint>
+#include <cstring>
+#include <cstdlib>
+
+#if defined(_WIN32) || defined( __CYGWIN__)
+    #define SPP_WIN
+#endif
+
+#ifdef SPP_WIN
+    #include <windows.h>
+    #include <Psapi.h>
+    #undef min
+    #undef max
+#elif defined(__linux__)
+    #include <sys/types.h>
+    #include <sys/sysinfo.h>
+#elif defined(__FreeBSD__)
+    #include <paths.h>
+    #include <fcntl.h>
+    #include <kvm.h>
+    #include <unistd.h>
+    #include <sys/sysctl.h>
+    #include <sys/user.h>
+#endif
+
+namespace spp
+{
+    uint64_t GetSystemMemory();
+    uint64_t GetTotalMemoryUsed();
+    uint64_t GetProcessMemoryUsed();
+    uint64_t GetPhysicalMemory();
+
+    uint64_t GetSystemMemory()
+    {
+#ifdef SPP_WIN
+        MEMORYSTATUSEX memInfo;
+        memInfo.dwLength = sizeof(MEMORYSTATUSEX);
+        GlobalMemoryStatusEx(&memInfo);
+        return static_cast<uint64_t>(memInfo.ullTotalPageFile);
+#elif defined(__linux__)
+        struct sysinfo memInfo;
+        sysinfo (&memInfo);
+        auto totalVirtualMem = memInfo.totalram;
+
+        totalVirtualMem += memInfo.totalswap;
+        totalVirtualMem *= memInfo.mem_unit;
+        return static_cast<uint64_t>(totalVirtualMem);
+#elif defined(__FreeBSD__)
+        kvm_t *kd;
+        u_int pageCnt;
+        size_t pageCntLen = sizeof(pageCnt);
+        u_int pageSize;
+        struct kvm_swap kswap;
+        uint64_t totalVirtualMem;
+
+        pageSize = static_cast<u_int>(getpagesize());
+
+        sysctlbyname("vm.stats.vm.v_page_count", &pageCnt, &pageCntLen, NULL, 0);
+        totalVirtualMem = pageCnt * pageSize;
+
+        kd = kvm_open(NULL, _PATH_DEVNULL, NULL, O_RDONLY, "kvm_open");
+        kvm_getswapinfo(kd, &kswap, 1, 0);
+        kvm_close(kd);
+        totalVirtualMem += kswap.ksw_total * pageSize;
+
+        return totalVirtualMem;
+#else
+        return 0;
+#endif
+    }
+
+    uint64_t GetTotalMemoryUsed()
+    {
+#ifdef SPP_WIN
+        MEMORYSTATUSEX memInfo;
+        memInfo.dwLength = sizeof(MEMORYSTATUSEX);
+        GlobalMemoryStatusEx(&memInfo);
+        return static_cast<uint64_t>(memInfo.ullTotalPageFile - memInfo.ullAvailPageFile);
+#elif defined(__linux__)
+        struct sysinfo memInfo;
+        sysinfo(&memInfo);
+        auto virtualMemUsed = memInfo.totalram - memInfo.freeram;
+
+        virtualMemUsed += memInfo.totalswap - memInfo.freeswap;
+        virtualMemUsed *= memInfo.mem_unit;
+
+        return static_cast<uint64_t>(virtualMemUsed);
+#elif defined(__FreeBSD__)
+        kvm_t *kd;
+        u_int pageSize;
+        u_int pageCnt, freeCnt;
+        size_t pageCntLen = sizeof(pageCnt);
+        size_t freeCntLen = sizeof(freeCnt);
+        struct kvm_swap kswap;
+        uint64_t virtualMemUsed;
+
+        pageSize = static_cast<u_int>(getpagesize());
+
+        sysctlbyname("vm.stats.vm.v_page_count", &pageCnt, &pageCntLen, NULL, 0);
+        sysctlbyname("vm.stats.vm.v_free_count", &freeCnt, &freeCntLen, NULL, 0);
+        virtualMemUsed = (pageCnt - freeCnt) * pageSize;
+
+        kd = kvm_open(NULL, _PATH_DEVNULL, NULL, O_RDONLY, "kvm_open");
+        kvm_getswapinfo(kd, &kswap, 1, 0);
+        kvm_close(kd);
+        virtualMemUsed += kswap.ksw_used * pageSize;
+
+        return virtualMemUsed;
+#else
+        return 0;
+#endif
+    }
+
+    uint64_t GetProcessMemoryUsed()
+    {
+#ifdef SPP_WIN
+        PROCESS_MEMORY_COUNTERS_EX pmc;
+        GetProcessMemoryInfo(GetCurrentProcess(), reinterpret_cast<PPROCESS_MEMORY_COUNTERS>(&pmc), sizeof(pmc));
+        return static_cast<uint64_t>(pmc.PrivateUsage);
+#elif defined(__linux__)
+        auto parseLine = 
+            [](char* line)->int
+            {
+                auto i = strlen(line);
+				
+                while(*line < '0' || *line > '9') 
+                {
+                    line++;
+                }
+
+                line[i-3] = '\0';
+                i = atoi(line);
+                return i;
+            };
+
+        auto file = fopen("/proc/self/status", "r");
+        auto result = -1;
+        char line[128];
+
+        while(fgets(line, 128, file) != nullptr)
+        {
+            if(strncmp(line, "VmSize:", 7) == 0)
+            {
+                result = parseLine(line);
+                break;
+            }
+        }
+
+        fclose(file);
+        return static_cast<uint64_t>(result) * 1024;
+#elif defined(__FreeBSD__)
+        struct kinfo_proc info;
+        size_t infoLen = sizeof(info);
+        int mib[] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, getpid() };
+
+        sysctl(mib, sizeof(mib) / sizeof(*mib), &info, &infoLen, NULL, 0);
+        return static_cast<uint64_t>(info.ki_rssize * getpagesize());
+#else
+        return 0;
+#endif
+    }
+
+    uint64_t GetPhysicalMemory()
+    {
+#ifdef SPP_WIN
+        MEMORYSTATUSEX memInfo;
+        memInfo.dwLength = sizeof(MEMORYSTATUSEX);
+        GlobalMemoryStatusEx(&memInfo);
+        return static_cast<uint64_t>(memInfo.ullTotalPhys);
+#elif defined(__linux__)
+        struct sysinfo memInfo;
+        sysinfo(&memInfo);
+
+        auto totalPhysMem = memInfo.totalram;
+
+        totalPhysMem *= memInfo.mem_unit;
+        return static_cast<uint64_t>(totalPhysMem);
+#elif defined(__FreeBSD__)
+        u_long physMem;
+        size_t physMemLen = sizeof(physMem);
+        int mib[] = { CTL_HW, HW_PHYSMEM };
+
+        sysctl(mib, sizeof(mib) / sizeof(*mib), &physMem, &physMemLen, NULL, 0);
+        return physMem;
+#else
+        return 0;
+#endif
+    }
+
+}
+
+#endif // spp_memory_h_guard

src/includes/3thparty/parallel_hashmap/phmap_bits.h

@@ -0,0 +1,663 @@
+#if !defined(phmap_bits_h_guard_)
+#define phmap_bits_h_guard_
+
+// ---------------------------------------------------------------------------
+// Copyright (c) 2019, Gregory Popovitch - greg7mdp@gmail.com
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Includes work from abseil-cpp (https://github.com/abseil/abseil-cpp)
+// with modifications.
+// 
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ---------------------------------------------------------------------------
+
+// The following guarantees declaration of the byte swap functions
+#ifdef _MSC_VER
+    #include <stdlib.h>  // NOLINT(build/include)
+#elif defined(__APPLE__)
+    // Mac OS X / Darwin features
+    #include <libkern/OSByteOrder.h>
+#elif defined(__FreeBSD__)
+    #include <sys/endian.h>
+#elif defined(__GLIBC__)
+    #include <byteswap.h>  // IWYU pragma: export
+#endif
+
+#include <string.h>
+#include <cstdint>
+#include "phmap_config.h"
+
+#ifdef _MSC_VER
+    #pragma warning(push)  
+    #pragma warning(disable : 4514) // unreferenced inline function has been removed
+#endif
+
+// -----------------------------------------------------------------------------
+// unaligned APIs
+// -----------------------------------------------------------------------------
+// Portable handling of unaligned loads, stores, and copies.
+// On some platforms, like ARM, the copy functions can be more efficient
+// then a load and a store.
+// -----------------------------------------------------------------------------
+
+#if defined(ADDRESS_SANITIZER) || defined(THREAD_SANITIZER) ||\
+    defined(MEMORY_SANITIZER)
+#include <stdint.h>
+
+extern "C" {
+    uint16_t __sanitizer_unaligned_load16(const void *p);
+    uint32_t __sanitizer_unaligned_load32(const void *p);
+    uint64_t __sanitizer_unaligned_load64(const void *p);
+    void __sanitizer_unaligned_store16(void *p, uint16_t v);
+    void __sanitizer_unaligned_store32(void *p, uint32_t v);
+    void __sanitizer_unaligned_store64(void *p, uint64_t v);
+}  // extern "C"
+
+namespace phmap {
+namespace bits {
+
+inline uint16_t UnalignedLoad16(const void *p) {
+  return __sanitizer_unaligned_load16(p);
+}
+
+inline uint32_t UnalignedLoad32(const void *p) {
+  return __sanitizer_unaligned_load32(p);
+}
+
+inline uint64_t UnalignedLoad64(const void *p) {
+  return __sanitizer_unaligned_load64(p);
+}
+
+inline void UnalignedStore16(void *p, uint16_t v) {
+  __sanitizer_unaligned_store16(p, v);
+}
+
+inline void UnalignedStore32(void *p, uint32_t v) {
+  __sanitizer_unaligned_store32(p, v);
+}
+
+inline void UnalignedStore64(void *p, uint64_t v) {
+  __sanitizer_unaligned_store64(p, v);
+}
+
+}  // namespace bits
+}  // namespace phmap
+
+#define PHMAP_INTERNAL_UNALIGNED_LOAD16(_p) (phmap::bits::UnalignedLoad16(_p))
+#define PHMAP_INTERNAL_UNALIGNED_LOAD32(_p) (phmap::bits::UnalignedLoad32(_p))
+#define PHMAP_INTERNAL_UNALIGNED_LOAD64(_p) (phmap::bits::UnalignedLoad64(_p))
+
+#define PHMAP_INTERNAL_UNALIGNED_STORE16(_p, _val) (phmap::bits::UnalignedStore16(_p, _val))
+#define PHMAP_INTERNAL_UNALIGNED_STORE32(_p, _val) (phmap::bits::UnalignedStore32(_p, _val))
+#define PHMAP_INTERNAL_UNALIGNED_STORE64(_p, _val) (phmap::bits::UnalignedStore64(_p, _val))
+
+#else
+
+namespace phmap {
+namespace bits {
+
+inline uint16_t UnalignedLoad16(const void *p) {
+  uint16_t t;
+  memcpy(&t, p, sizeof t);
+  return t;
+}
+
+inline uint32_t UnalignedLoad32(const void *p) {
+  uint32_t t;
+  memcpy(&t, p, sizeof t);
+  return t;
+}
+
+inline uint64_t UnalignedLoad64(const void *p) {
+  uint64_t t;
+  memcpy(&t, p, sizeof t);
+  return t;
+}
+
+inline void UnalignedStore16(void *p, uint16_t v) { memcpy(p, &v, sizeof v); }
+
+inline void UnalignedStore32(void *p, uint32_t v) { memcpy(p, &v, sizeof v); }
+
+inline void UnalignedStore64(void *p, uint64_t v) { memcpy(p, &v, sizeof v); }
+
+}  // namespace bits
+}  // namespace phmap
+
+#define PHMAP_INTERNAL_UNALIGNED_LOAD16(_p) (phmap::bits::UnalignedLoad16(_p))
+#define PHMAP_INTERNAL_UNALIGNED_LOAD32(_p) (phmap::bits::UnalignedLoad32(_p))
+#define PHMAP_INTERNAL_UNALIGNED_LOAD64(_p) (phmap::bits::UnalignedLoad64(_p))
+
+#define PHMAP_INTERNAL_UNALIGNED_STORE16(_p, _val) (phmap::bits::UnalignedStore16(_p, _val))
+#define PHMAP_INTERNAL_UNALIGNED_STORE32(_p, _val) (phmap::bits::UnalignedStore32(_p, _val))
+#define PHMAP_INTERNAL_UNALIGNED_STORE64(_p, _val) (phmap::bits::UnalignedStore64(_p, _val))
+
+#endif
+
+// -----------------------------------------------------------------------------
+// File: optimization.h
+// -----------------------------------------------------------------------------
+
+#if defined(__pnacl__)
+    #define PHMAP_BLOCK_TAIL_CALL_OPTIMIZATION() if (volatile int x = 0) { (void)x; }
+#elif defined(__clang__)
+    // Clang will not tail call given inline volatile assembly.
+    #define PHMAP_BLOCK_TAIL_CALL_OPTIMIZATION() __asm__ __volatile__("")
+#elif defined(__GNUC__)
+    // GCC will not tail call given inline volatile assembly.
+    #define PHMAP_BLOCK_TAIL_CALL_OPTIMIZATION() __asm__ __volatile__("")
+#elif defined(_MSC_VER)
+    #include <intrin.h>
+    // The __nop() intrinsic blocks the optimisation.
+    #define PHMAP_BLOCK_TAIL_CALL_OPTIMIZATION() __nop()
+#else
+    #define PHMAP_BLOCK_TAIL_CALL_OPTIMIZATION() if (volatile int x = 0) { (void)x; }
+#endif
+
+#if defined(__GNUC__)
+    #pragma GCC diagnostic push
+    #pragma GCC diagnostic ignored "-Wpedantic"
+#endif
+
+#ifdef PHMAP_HAVE_INTRINSIC_INT128
+    __extension__ typedef unsigned __int128 phmap_uint128;
+    inline uint64_t umul128(uint64_t a, uint64_t b, uint64_t* high) 
+    {
+        auto result = static_cast<phmap_uint128>(a) * static_cast<phmap_uint128>(b);
+        *high = static_cast<uint64_t>(result >> 64);
+        return static_cast<uint64_t>(result);
+    }
+    #define PHMAP_HAS_UMUL128 1
+#elif (defined(_MSC_VER))
+    #if defined(_M_X64)
+        #pragma intrinsic(_umul128)
+        inline uint64_t umul128(uint64_t a, uint64_t b, uint64_t* high) 
+        {
+            return _umul128(a, b, high);
+        }
+        #define PHMAP_HAS_UMUL128 1
+    #endif
+#endif
+
+#if defined(__GNUC__)
+    #pragma GCC diagnostic pop
+#endif
+
+#if defined(__GNUC__)
+    // Cache line alignment
+    #if defined(__i386__) || defined(__x86_64__)
+        #define PHMAP_CACHELINE_SIZE 64
+    #elif defined(__powerpc64__)
+        #define PHMAP_CACHELINE_SIZE 128
+    #elif defined(__aarch64__)
+        // We would need to read special register ctr_el0 to find out L1 dcache size.
+        // This value is a good estimate based on a real aarch64 machine.
+        #define PHMAP_CACHELINE_SIZE 64
+    #elif defined(__arm__)
+        // Cache line sizes for ARM: These values are not strictly correct since
+        // cache line sizes depend on implementations, not architectures.  There
+        // are even implementations with cache line sizes configurable at boot
+        // time.
+        #if defined(__ARM_ARCH_5T__)
+            #define PHMAP_CACHELINE_SIZE 32
+        #elif defined(__ARM_ARCH_7A__)
+            #define PHMAP_CACHELINE_SIZE 64
+        #endif
+    #endif
+
+    #ifndef PHMAP_CACHELINE_SIZE
+        // A reasonable default guess.  Note that overestimates tend to waste more
+        // space, while underestimates tend to waste more time.
+        #define PHMAP_CACHELINE_SIZE 64
+    #endif
+
+    #define PHMAP_CACHELINE_ALIGNED __attribute__((aligned(PHMAP_CACHELINE_SIZE)))
+#elif defined(_MSC_VER)
+    #define PHMAP_CACHELINE_SIZE 64
+    #define PHMAP_CACHELINE_ALIGNED __declspec(align(PHMAP_CACHELINE_SIZE))
+#else
+    #define PHMAP_CACHELINE_SIZE 64
+    #define PHMAP_CACHELINE_ALIGNED
+#endif
+
+
+#if PHMAP_HAVE_BUILTIN(__builtin_expect) || \
+    (defined(__GNUC__) && !defined(__clang__))
+    #define PHMAP_PREDICT_FALSE(x) (__builtin_expect(x, 0))
+    #define PHMAP_PREDICT_TRUE(x) (__builtin_expect(!!(x), 1))
+#else
+    #define PHMAP_PREDICT_FALSE(x) (x)
+    #define PHMAP_PREDICT_TRUE(x) (x)
+#endif
+
+// -----------------------------------------------------------------------------
+// File: bits.h
+// -----------------------------------------------------------------------------
+
+#if defined(_MSC_VER)
+    // We can achieve something similar to attribute((always_inline)) with MSVC by
+    // using the __forceinline keyword, however this is not perfect. MSVC is
+    // much less aggressive about inlining, and even with the __forceinline keyword.
+    #define PHMAP_BASE_INTERNAL_FORCEINLINE __forceinline
+#else
+    // Use default attribute inline.
+    #define PHMAP_BASE_INTERNAL_FORCEINLINE inline PHMAP_ATTRIBUTE_ALWAYS_INLINE
+#endif
+
+
+namespace phmap {
+namespace base_internal {
+
+PHMAP_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros64Slow(uint64_t n) {
+    int zeroes = 60;
+    if (n >> 32) zeroes -= 32, n >>= 32;
+    if (n >> 16) zeroes -= 16, n >>= 16;
+    if (n >> 8) zeroes -= 8, n >>= 8;
+    if (n >> 4) zeroes -= 4, n >>= 4;
+    return "\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0"[n] + zeroes;
+}
+
+PHMAP_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros64(uint64_t n) {
+#if defined(_MSC_VER) && defined(_M_X64)
+    // MSVC does not have __buitin_clzll. Use _BitScanReverse64.
+    unsigned long result = 0;  // NOLINT(runtime/int)
+    if (_BitScanReverse64(&result, n)) {
+        return (int)(63 - result);
+    }
+    return 64;
+#elif defined(_MSC_VER)
+    // MSVC does not have __buitin_clzll. Compose two calls to _BitScanReverse
+    unsigned long result = 0;  // NOLINT(runtime/int)
+    if ((n >> 32) && _BitScanReverse(&result, (unsigned long)(n >> 32))) {
+        return 31 - result;
+    }
+    if (_BitScanReverse(&result, (unsigned long)n)) {
+        return 63 - result;
+    }
+    return 64;
+#elif defined(__GNUC__)
+    // Use __builtin_clzll, which uses the following instructions:
+    //  x86: bsr
+    //  ARM64: clz
+    //  PPC: cntlzd
+    static_assert(sizeof(unsigned long long) == sizeof(n),  // NOLINT(runtime/int)
+                  "__builtin_clzll does not take 64-bit arg");
+
+    // Handle 0 as a special case because __builtin_clzll(0) is undefined.
+    if (n == 0) {
+        return 64;
+    }
+    return __builtin_clzll(n);
+#else
+    return CountLeadingZeros64Slow(n);
+#endif
+}
+
+PHMAP_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros32Slow(uint64_t n) {
+    int zeroes = 28;
+    if (n >> 16) zeroes -= 16, n >>= 16;
+    if (n >> 8) zeroes -= 8, n >>= 8;
+    if (n >> 4) zeroes -= 4, n >>= 4;
+    return "\4\3\2\2\1\1\1\1\0\0\0\0\0\0\0"[n] + zeroes;
+}
+
+PHMAP_BASE_INTERNAL_FORCEINLINE int CountLeadingZeros32(uint32_t n) {
+#if defined(_MSC_VER)
+    unsigned long result = 0;  // NOLINT(runtime/int)
+    if (_BitScanReverse(&result, n)) {
+        return (int)(31 - result);
+    }
+    return 32;
+#elif defined(__GNUC__)
+    // Use __builtin_clz, which uses the following instructions:
+    //  x86: bsr
+    //  ARM64: clz
+    //  PPC: cntlzd
+    static_assert(sizeof(int) == sizeof(n),
+                  "__builtin_clz does not take 32-bit arg");
+
+    // Handle 0 as a special case because __builtin_clz(0) is undefined.
+    if (n == 0) {
+        return 32;
+    }
+    return __builtin_clz(n);
+#else
+    return CountLeadingZeros32Slow(n);
+#endif
+}
+
+PHMAP_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64Slow(uint64_t n) {
+    int c = 63;
+    n &= ~n + 1;
+    if (n & 0x00000000FFFFFFFF) c -= 32;
+    if (n & 0x0000FFFF0000FFFF) c -= 16;
+    if (n & 0x00FF00FF00FF00FF) c -= 8;
+    if (n & 0x0F0F0F0F0F0F0F0F) c -= 4;
+    if (n & 0x3333333333333333) c -= 2;
+    if (n & 0x5555555555555555) c -= 1;
+    return c;
+}
+
+PHMAP_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero64(uint64_t n) {
+#if defined(_MSC_VER) && defined(_M_X64)
+    unsigned long result = 0;  // NOLINT(runtime/int)
+    _BitScanForward64(&result, n);
+    return (int)result;
+#elif defined(_MSC_VER)
+    unsigned long result = 0;  // NOLINT(runtime/int)
+    if (static_cast<uint32_t>(n) == 0) {
+        _BitScanForward(&result, (unsigned long)(n >> 32));
+        return result + 32;
+    }
+    _BitScanForward(&result, (unsigned long)n);
+    return result;
+#elif defined(__GNUC__)
+    static_assert(sizeof(unsigned long long) == sizeof(n),  // NOLINT(runtime/int)
+                  "__builtin_ctzll does not take 64-bit arg");
+    return __builtin_ctzll(n);
+#else
+    return CountTrailingZerosNonZero64Slow(n);
+#endif
+}
+
+PHMAP_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero32Slow(uint32_t n) {
+    int c = 31;
+    n &= ~n + 1;
+    if (n & 0x0000FFFF) c -= 16;
+    if (n & 0x00FF00FF) c -= 8;
+    if (n & 0x0F0F0F0F) c -= 4;
+    if (n & 0x33333333) c -= 2;
+    if (n & 0x55555555) c -= 1;
+    return c;
+}
+
+PHMAP_BASE_INTERNAL_FORCEINLINE int CountTrailingZerosNonZero32(uint32_t n) {
+#if defined(_MSC_VER)
+    unsigned long result = 0;  // NOLINT(runtime/int)
+    _BitScanForward(&result, n);
+    return (int)result;
+#elif defined(__GNUC__)
+    static_assert(sizeof(int) == sizeof(n),
+                  "__builtin_ctz does not take 32-bit arg");
+    return __builtin_ctz(n);
+#else
+    return CountTrailingZerosNonZero32Slow(n);
+#endif
+}
+
+#undef PHMAP_BASE_INTERNAL_FORCEINLINE
+
+}  // namespace base_internal
+}  // namespace phmap
+
+// -----------------------------------------------------------------------------
+// File: endian.h
+// -----------------------------------------------------------------------------
+
+namespace phmap {
+
+// Use compiler byte-swapping intrinsics if they are available.  32-bit
+// and 64-bit versions are available in Clang and GCC as of GCC 4.3.0.
+// The 16-bit version is available in Clang and GCC only as of GCC 4.8.0.
+// For simplicity, we enable them all only for GCC 4.8.0 or later.
+#if defined(__clang__) || \
+    (defined(__GNUC__) && \
+     ((__GNUC__ == 4 && __GNUC_MINOR__ >= 8) || __GNUC__ >= 5))
+
+    inline uint64_t gbswap_64(uint64_t host_int) {
+        return __builtin_bswap64(host_int);
+    }
+    inline uint32_t gbswap_32(uint32_t host_int) {
+        return __builtin_bswap32(host_int);
+    }
+    inline uint16_t gbswap_16(uint16_t host_int) {
+        return __builtin_bswap16(host_int);
+    }
+
+#elif defined(_MSC_VER)
+
+    inline uint64_t gbswap_64(uint64_t host_int) {
+        return _byteswap_uint64(host_int);
+    }
+    inline uint32_t gbswap_32(uint32_t host_int) {
+        return _byteswap_ulong(host_int);
+    }
+    inline uint16_t gbswap_16(uint16_t host_int) {
+        return _byteswap_ushort(host_int);
+    }
+
+#elif defined(__APPLE__)
+
+    inline uint64_t gbswap_64(uint64_t host_int) { return OSSwapInt16(host_int); }
+    inline uint32_t gbswap_32(uint32_t host_int) { return OSSwapInt32(host_int); }
+    inline uint16_t gbswap_16(uint16_t host_int) { return OSSwapInt64(host_int); }
+
+#else
+
+    inline uint64_t gbswap_64(uint64_t host_int) {
+#if defined(__GNUC__) && defined(__x86_64__) && !defined(__APPLE__)
+        // Adapted from /usr/include/byteswap.h.  Not available on Mac.
+        if (__builtin_constant_p(host_int)) {
+            return __bswap_constant_64(host_int);
+        } else {
+            uint64_t result;
+            __asm__("bswap %0" : "=r"(result) : "0"(host_int));
+            return result;
+        }
+#elif defined(__GLIBC__)
+        return bswap_64(host_int);
+#else
+        return (((host_int & uint64_t{0xFF}) << 56) |
+                ((host_int & uint64_t{0xFF00}) << 40) |
+                ((host_int & uint64_t{0xFF0000}) << 24) |
+                ((host_int & uint64_t{0xFF000000}) << 8) |
+                ((host_int & uint64_t{0xFF00000000}) >> 8) |
+                ((host_int & uint64_t{0xFF0000000000}) >> 24) |
+                ((host_int & uint64_t{0xFF000000000000}) >> 40) |
+                ((host_int & uint64_t{0xFF00000000000000}) >> 56));
+#endif  // bswap_64
+    }
+
+    inline uint32_t gbswap_32(uint32_t host_int) {
+#if defined(__GLIBC__)
+        return bswap_32(host_int);
+#else
+        return (((host_int & uint32_t{0xFF}) << 24) |
+                ((host_int & uint32_t{0xFF00}) << 8) |
+                ((host_int & uint32_t{0xFF0000}) >> 8) |
+                ((host_int & uint32_t{0xFF000000}) >> 24));
+#endif
+    }
+
+    inline uint16_t gbswap_16(uint16_t host_int) {
+#if defined(__GLIBC__)
+        return bswap_16(host_int);
+#else
+        return (((host_int & uint16_t{0xFF}) << 8) |
+                ((host_int & uint16_t{0xFF00}) >> 8));
+#endif
+    }
+
+#endif  // intrinics available
+
+#ifdef PHMAP_IS_LITTLE_ENDIAN
+
+    // Definitions for ntohl etc. that don't require us to include
+    // netinet/in.h. We wrap gbswap_32 and gbswap_16 in functions rather
+    // than just #defining them because in debug mode, gcc doesn't
+    // correctly handle the (rather involved) definitions of bswap_32.
+    // gcc guarantees that inline functions are as fast as macros, so
+    // this isn't a performance hit.
+    inline uint16_t ghtons(uint16_t x) { return gbswap_16(x); }
+    inline uint32_t ghtonl(uint32_t x) { return gbswap_32(x); }
+    inline uint64_t ghtonll(uint64_t x) { return gbswap_64(x); }
+
+#elif defined PHMAP_IS_BIG_ENDIAN
+
+    // These definitions are simpler on big-endian machines
+    // These are functions instead of macros to avoid self-assignment warnings
+    // on calls such as "i = ghtnol(i);".  This also provides type checking.
+    inline uint16_t ghtons(uint16_t x) { return x; }
+    inline uint32_t ghtonl(uint32_t x) { return x; }
+    inline uint64_t ghtonll(uint64_t x) { return x; }
+
+#else
+    #error \
+        "Unsupported byte order: Either PHMAP_IS_BIG_ENDIAN or " \
+           "PHMAP_IS_LITTLE_ENDIAN must be defined"
+#endif  // byte order
+
+inline uint16_t gntohs(uint16_t x) { return ghtons(x); }
+inline uint32_t gntohl(uint32_t x) { return ghtonl(x); }
+inline uint64_t gntohll(uint64_t x) { return ghtonll(x); }
+
+// Utilities to convert numbers between the current hosts's native byte
+// order and little-endian byte order
+//
+// Load/Store methods are alignment safe
+namespace little_endian {
+// Conversion functions.
+#ifdef PHMAP_IS_LITTLE_ENDIAN
+
+    inline uint16_t FromHost16(uint16_t x) { return x; }
+    inline uint16_t ToHost16(uint16_t x) { return x; }
+
+    inline uint32_t FromHost32(uint32_t x) { return x; }
+    inline uint32_t ToHost32(uint32_t x) { return x; }
+
+    inline uint64_t FromHost64(uint64_t x) { return x; }
+    inline uint64_t ToHost64(uint64_t x) { return x; }
+
+    inline constexpr bool IsLittleEndian() { return true; }
+
+#elif defined PHMAP_IS_BIG_ENDIAN
+
+    inline uint16_t FromHost16(uint16_t x) { return gbswap_16(x); }
+    inline uint16_t ToHost16(uint16_t x) { return gbswap_16(x); }
+
+    inline uint32_t FromHost32(uint32_t x) { return gbswap_32(x); }
+    inline uint32_t ToHost32(uint32_t x) { return gbswap_32(x); }
+
+    inline uint64_t FromHost64(uint64_t x) { return gbswap_64(x); }
+    inline uint64_t ToHost64(uint64_t x) { return gbswap_64(x); }
+
+    inline constexpr bool IsLittleEndian() { return false; }
+
+#endif /* ENDIAN */
+
+// Functions to do unaligned loads and stores in little-endian order.
+inline uint16_t Load16(const void *p) {
+  return ToHost16(PHMAP_INTERNAL_UNALIGNED_LOAD16(p));
+}
+
+inline void Store16(void *p, uint16_t v) {
+  PHMAP_INTERNAL_UNALIGNED_STORE16(p, FromHost16(v));
+}
+
+inline uint32_t Load32(const void *p) {
+  return ToHost32(PHMAP_INTERNAL_UNALIGNED_LOAD32(p));
+}
+
+inline void Store32(void *p, uint32_t v) {
+  PHMAP_INTERNAL_UNALIGNED_STORE32(p, FromHost32(v));
+}
+
+inline uint64_t Load64(const void *p) {
+  return ToHost64(PHMAP_INTERNAL_UNALIGNED_LOAD64(p));
+}
+
+inline void Store64(void *p, uint64_t v) {
+  PHMAP_INTERNAL_UNALIGNED_STORE64(p, FromHost64(v));
+}
+
+}  // namespace little_endian
+
+// Utilities to convert numbers between the current hosts's native byte
+// order and big-endian byte order (same as network byte order)
+//
+// Load/Store methods are alignment safe
+namespace big_endian {
+#ifdef PHMAP_IS_LITTLE_ENDIAN
+
+    inline uint16_t FromHost16(uint16_t x) { return gbswap_16(x); }
+    inline uint16_t ToHost16(uint16_t x) { return gbswap_16(x); }
+
+    inline uint32_t FromHost32(uint32_t x) { return gbswap_32(x); }
+    inline uint32_t ToHost32(uint32_t x) { return gbswap_32(x); }
+
+    inline uint64_t FromHost64(uint64_t x) { return gbswap_64(x); }
+    inline uint64_t ToHost64(uint64_t x) { return gbswap_64(x); }
+
+    inline constexpr bool IsLittleEndian() { return true; }
+
+#elif defined PHMAP_IS_BIG_ENDIAN
+
+    inline uint16_t FromHost16(uint16_t x) { return x; }
+    inline uint16_t ToHost16(uint16_t x) { return x; }
+
+    inline uint32_t FromHost32(uint32_t x) { return x; }
+    inline uint32_t ToHost32(uint32_t x) { return x; }
+
+    inline uint64_t FromHost64(uint64_t x) { return x; }
+    inline uint64_t ToHost64(uint64_t x) { return x; }
+
+    inline constexpr bool IsLittleEndian() { return false; }
+
+#endif /* ENDIAN */
+
+// Functions to do unaligned loads and stores in big-endian order.
+inline uint16_t Load16(const void *p) {
+  return ToHost16(PHMAP_INTERNAL_UNALIGNED_LOAD16(p));
+}
+
+inline void Store16(void *p, uint16_t v) {
+  PHMAP_INTERNAL_UNALIGNED_STORE16(p, FromHost16(v));
+}
+
+inline uint32_t Load32(const void *p) {
+  return ToHost32(PHMAP_INTERNAL_UNALIGNED_LOAD32(p));
+}
+
+inline void Store32(void *p, uint32_t v) {
+  PHMAP_INTERNAL_UNALIGNED_STORE32(p, FromHost32(v));
+}
+
+inline uint64_t Load64(const void *p) {
+  return ToHost64(PHMAP_INTERNAL_UNALIGNED_LOAD64(p));
+}
+
+inline void Store64(void *p, uint64_t v) {
+  PHMAP_INTERNAL_UNALIGNED_STORE64(p, FromHost64(v));
+}
+
+}  // namespace big_endian
+
+}  // namespace phmap
+
+#ifdef _MSC_VER
+     #pragma warning(pop)  
+#endif
+
+#endif // phmap_bits_h_guard_

src/includes/3thparty/parallel_hashmap/phmap_config.h

@@ -0,0 +1,753 @@
+#if !defined(phmap_config_h_guard_)
+#define phmap_config_h_guard_
+
+// ---------------------------------------------------------------------------
+// Copyright (c) 2019, Gregory Popovitch - greg7mdp@gmail.com
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Includes work from abseil-cpp (https://github.com/abseil/abseil-cpp)
+// with modifications.
+// 
+// Copyright 2018 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ---------------------------------------------------------------------------
+
+#define PHMAP_VERSION_MAJOR 1
+#define PHMAP_VERSION_MINOR 0
+#define PHMAP_VERSION_PATCH 0
+
+// Included for the __GLIBC__ macro (or similar macros on other systems).
+#include <limits.h>
+
+#ifdef __cplusplus
+    // Included for __GLIBCXX__, _LIBCPP_VERSION
+    #include <cstddef>
+#endif  // __cplusplus
+
+#if defined(__APPLE__)
+    // Included for TARGET_OS_IPHONE, __IPHONE_OS_VERSION_MIN_REQUIRED,
+    // __IPHONE_8_0.
+    #include <Availability.h>
+    #include <TargetConditionals.h>
+#endif
+
+#define PHMAP_XSTR(x) PHMAP_STR(x)
+#define PHMAP_STR(x) #x
+#define PHMAP_VAR_NAME_VALUE(var) #var "="  PHMAP_STR(var)
+
+// -----------------------------------------------------------------------------
+// Some sanity checks
+// -----------------------------------------------------------------------------
+//#if defined(__CYGWIN__)
+//    #error "Cygwin is not supported."
+//#endif
+
+#if defined(_MSC_FULL_VER) && _MSC_FULL_VER < 190023918 && !defined(__clang__)
+    #error "phmap requires Visual Studio 2015 Update 2 or higher."
+#endif
+
+// We support gcc 4.7 and later.
+#if defined(__GNUC__) && !defined(__clang__)
+    #if __GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 7)
+        #error "phmap requires gcc 4.7 or higher."
+    #endif
+#endif
+
+// We support Apple Xcode clang 4.2.1 (version 421.11.65) and later.
+// This corresponds to Apple Xcode version 4.5.
+#if defined(__apple_build_version__) && __apple_build_version__ < 4211165
+    #error "phmap requires __apple_build_version__ of 4211165 or higher."
+#endif
+
+// Enforce C++11 as the minimum. 
+#if defined(__cplusplus) && !defined(_MSC_VER)
+    #if __cplusplus < 201103L
+        #error "C++ versions less than C++11 are not supported."
+    #endif
+#endif
+
+// We have chosen glibc 2.12 as the minimum 
+#if defined(__GLIBC__) && defined(__GLIBC_PREREQ)
+    #if !__GLIBC_PREREQ(2, 12)
+        #error "Minimum required version of glibc is 2.12."
+    #endif
+#endif
+
+#if defined(_STLPORT_VERSION)
+    #error "STLPort is not supported."
+#endif
+
+#if CHAR_BIT != 8
+    #error "phmap assumes CHAR_BIT == 8."
+#endif
+
+// phmap currently assumes that an int is 4 bytes. 
+#if INT_MAX < 2147483647
+    #error "phmap assumes that int is at least 4 bytes. "
+#endif
+
+
+// -----------------------------------------------------------------------------
+// Compiler Feature Checks
+// -----------------------------------------------------------------------------
+
+#ifdef __has_builtin
+    #define PHMAP_HAVE_BUILTIN(x) __has_builtin(x)
+#else
+    #define PHMAP_HAVE_BUILTIN(x) 0
+#endif
+
+// ----------------------------------------------------------------
+// Checks whether `std::is_trivially_destructible<T>` is supported.
+// ----------------------------------------------------------------
+#ifdef PHMAP_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE
+    #error PHMAP_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE cannot be directly set
+#elif defined(_LIBCPP_VERSION) ||                                        \
+    (!defined(__clang__) && defined(__GNUC__) && defined(__GLIBCXX__) && \
+     (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 8))) ||        \
+    defined(_MSC_VER)
+    #define PHMAP_HAVE_STD_IS_TRIVIALLY_DESTRUCTIBLE 1
+#endif
+
+// --------------------------------------------------------------
+// Checks whether `std::is_trivially_default_constructible<T>` is 
+// supported.
+// --------------------------------------------------------------
+#if defined(PHMAP_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE)
+    #error PHMAP_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE cannot be directly set
+#elif defined(PHMAP_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE)
+    #error PHMAP_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE cannot directly set
+#elif (defined(__clang__) && defined(_LIBCPP_VERSION)) ||        \
+    (!defined(__clang__) && defined(__GNUC__) &&                 \
+     (__GNUC__ > 5 || (__GNUC__ == 5 && __GNUC_MINOR__ >= 1)) && \
+     (defined(_LIBCPP_VERSION) || defined(__GLIBCXX__))) ||      \
+    (defined(_MSC_VER) && !defined(__NVCC__))
+    #define PHMAP_HAVE_STD_IS_TRIVIALLY_CONSTRUCTIBLE 1
+    #define PHMAP_HAVE_STD_IS_TRIVIALLY_ASSIGNABLE 1
+#endif
+
+// -------------------------------------------------------------------
+// Checks whether C++11's `thread_local` storage duration specifier is
+// supported.
+// -------------------------------------------------------------------
+#ifdef PHMAP_HAVE_THREAD_LOCAL
+    #error PHMAP_HAVE_THREAD_LOCAL cannot be directly set
+#elif defined(__APPLE__)
+    #if __has_feature(cxx_thread_local) && \
+        !(TARGET_OS_IPHONE && __IPHONE_OS_VERSION_MIN_REQUIRED < __IPHONE_9_0)
+        #define PHMAP_HAVE_THREAD_LOCAL 1
+    #endif
+#else  // !defined(__APPLE__)
+    #define PHMAP_HAVE_THREAD_LOCAL 1
+#endif
+
+#if defined(__ANDROID__) && defined(__clang__)
+
+    #if __has_include(<android/ndk-version.h>)
+        #include <android/ndk-version.h>
+    #endif  // __has_include(<android/ndk-version.h>)
+
+    #if defined(__ANDROID__) && defined(__clang__) && defined(__NDK_MAJOR__) && \
+        defined(__NDK_MINOR__) &&                                               \
+        ((__NDK_MAJOR__ < 12) || ((__NDK_MAJOR__ == 12) && (__NDK_MINOR__ < 1)))
+        #undef PHMAP_HAVE_TLS
+        #undef PHMAP_HAVE_THREAD_LOCAL
+    #endif
+#endif 
+
+// ------------------------------------------------------------
+// Checks whether the __int128 compiler extension for a 128-bit 
+// integral type is supported.
+// ------------------------------------------------------------
+#ifdef PHMAP_HAVE_INTRINSIC_INT128
+    #error PHMAP_HAVE_INTRINSIC_INT128 cannot be directly set
+#elif defined(__SIZEOF_INT128__)
+    #if (defined(__clang__) && !defined(_WIN32) && !defined(__aarch64__)) || \
+        (defined(__CUDACC__) && __CUDACC_VER_MAJOR__ >= 9) ||                \
+        (defined(__GNUC__) && !defined(__clang__) && !defined(__CUDACC__))
+        #define PHMAP_HAVE_INTRINSIC_INT128 1
+    #elif defined(__CUDACC__)
+        #if __CUDACC_VER__ >= 70000
+            #define PHMAP_HAVE_INTRINSIC_INT128 1
+        #endif  // __CUDACC_VER__ >= 70000
+    #endif  // defined(__CUDACC__)
+#endif
+
+// ------------------------------------------------------------------
+// Checks whether the compiler both supports and enables exceptions. 
+// ------------------------------------------------------------------
+#ifdef PHMAP_HAVE_EXCEPTIONS
+    #error PHMAP_HAVE_EXCEPTIONS cannot be directly set.
+#elif defined(__clang__)
+    #if defined(__EXCEPTIONS) && __has_feature(cxx_exceptions)
+        #define PHMAP_HAVE_EXCEPTIONS 1
+    #endif  // defined(__EXCEPTIONS) && __has_feature(cxx_exceptions)
+#elif !(defined(__GNUC__) && (__GNUC__ < 5) && !defined(__EXCEPTIONS)) &&    \
+    !(defined(__GNUC__) && (__GNUC__ >= 5) && !defined(__cpp_exceptions)) && \
+    !(defined(_MSC_VER) && !defined(_CPPUNWIND))
+    #define PHMAP_HAVE_EXCEPTIONS 1
+#endif
+
+
+// -----------------------------------------------------------------------
+// Checks whether the platform has an mmap(2) implementation as defined in
+// POSIX.1-2001.
+// -----------------------------------------------------------------------
+#ifdef PHMAP_HAVE_MMAP
+    #error PHMAP_HAVE_MMAP cannot be directly set
+#elif defined(__linux__) || defined(__APPLE__) || defined(__FreeBSD__) ||   \
+    defined(__ros__) || defined(__native_client__) || defined(__asmjs__) || \
+    defined(__wasm__) || defined(__Fuchsia__) || defined(__sun) || \
+    defined(__ASYLO__)
+    #define PHMAP_HAVE_MMAP 1
+#endif
+
+// -----------------------------------------------------------------------
+// Checks the endianness of the platform.
+// -----------------------------------------------------------------------
+#if defined(PHMAP_IS_BIG_ENDIAN)
+    #error "PHMAP_IS_BIG_ENDIAN cannot be directly set."
+#endif
+
+#if defined(PHMAP_IS_LITTLE_ENDIAN)
+    #error "PHMAP_IS_LITTLE_ENDIAN cannot be directly set."
+#endif
+
+#if (defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) && \
+     __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
+    #define PHMAP_IS_LITTLE_ENDIAN 1
+#elif defined(__BYTE_ORDER__) && defined(__ORDER_BIG_ENDIAN__) && \
+    __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+    #define PHMAP_IS_BIG_ENDIAN 1
+#elif defined(_WIN32)
+    #define PHMAP_IS_LITTLE_ENDIAN 1
+#else
+    #error "phmap endian detection needs to be set up for your compiler"
+#endif
+
+#if defined(__APPLE__) && defined(_LIBCPP_VERSION) && \
+    defined(__MAC_OS_X_VERSION_MIN_REQUIRED__) &&     \
+    __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ < 101400
+    #define PHMAP_INTERNAL_MACOS_CXX17_TYPES_UNAVAILABLE 1
+#else
+    #define PHMAP_INTERNAL_MACOS_CXX17_TYPES_UNAVAILABLE 0
+#endif
+
+// ---------------------------------------------------------------------------
+// Checks whether C++17 std::any is available by checking whether <any> exists.
+// ---------------------------------------------------------------------------
+#ifdef PHMAP_HAVE_STD_ANY
+    #error "PHMAP_HAVE_STD_ANY cannot be directly set."
+#endif
+
+#ifdef __has_include
+    #if __has_include(<any>) && __cplusplus >= 201703L && \
+        !PHMAP_INTERNAL_MACOS_CXX17_TYPES_UNAVAILABLE
+        #define PHMAP_HAVE_STD_ANY 1
+    #endif
+#endif
+
+#ifdef PHMAP_HAVE_STD_OPTIONAL
+    #error "PHMAP_HAVE_STD_OPTIONAL cannot be directly set."
+#endif
+
+#ifdef __has_include
+    #if __has_include(<optional>) && __cplusplus >= 201703L && \
+        !PHMAP_INTERNAL_MACOS_CXX17_TYPES_UNAVAILABLE
+        #define PHMAP_HAVE_STD_OPTIONAL 1
+    #endif
+#endif
+
+#ifdef PHMAP_HAVE_STD_VARIANT
+    #error "PHMAP_HAVE_STD_VARIANT cannot be directly set."
+#endif
+
+#ifdef __has_include
+    #if __has_include(<variant>) && __cplusplus >= 201703L && \
+        !PHMAP_INTERNAL_MACOS_CXX17_TYPES_UNAVAILABLE
+        #define PHMAP_HAVE_STD_VARIANT 1
+    #endif
+#endif
+
+#ifdef PHMAP_HAVE_STD_STRING_VIEW
+    #error "PHMAP_HAVE_STD_STRING_VIEW cannot be directly set."
+#endif
+
+#ifdef __has_include
+    #if __has_include(<string_view>) && __cplusplus >= 201703L
+        #define PHMAP_HAVE_STD_STRING_VIEW 1
+    #endif
+#endif
+
+// #pragma message(PHMAP_VAR_NAME_VALUE(_MSVC_LANG))
+
+#if defined(_MSC_VER) && _MSC_VER >= 1910 && \
+    ((defined(_MSVC_LANG) && _MSVC_LANG >= 201703) || __cplusplus >= 201703)
+    // #define PHMAP_HAVE_STD_ANY 1
+    #define PHMAP_HAVE_STD_OPTIONAL 1
+    #define PHMAP_HAVE_STD_VARIANT 1
+    #define PHMAP_HAVE_STD_STRING_VIEW 1
+#endif
+
+#if (defined(_MSVC_LANG) && _MSVC_LANG >= 201703) || __cplusplus >= 201703
+    #define PHMAP_HAVE_SHARED_MUTEX 1
+#endif
+
+#ifndef PHMAP_HAVE_STD_STRING_VIEW
+    #define PHMAP_HAVE_STD_STRING_VIEW 0
+#endif
+
+// In debug mode, MSVC 2017's std::variant throws a EXCEPTION_ACCESS_VIOLATION
+// SEH exception from emplace for variant<SomeStruct> when constructing the
+// struct can throw. This defeats some of variant_test and
+// variant_exception_safety_test.
+#if defined(_MSC_VER) && _MSC_VER >= 1700 && defined(_DEBUG)
+    #define PHMAP_INTERNAL_MSVC_2017_DBG_MODE
+#endif
+
+
+// -----------------------------------------------------------------------------
+// Sanitizer Attributes
+// -----------------------------------------------------------------------------
+//
+// Sanitizer-related attributes are not "defined" in this file (and indeed
+// are not defined as such in any file). To utilize the following
+// sanitizer-related attributes within your builds, define the following macros
+// within your build using a `-D` flag, along with the given value for
+// `-fsanitize`:
+//
+//   * `ADDRESS_SANITIZER` + `-fsanitize=address` (Clang, GCC 4.8)
+//   * `MEMORY_SANITIZER` + `-fsanitize=memory` (Clang-only)
+//   * `THREAD_SANITIZER + `-fsanitize=thread` (Clang, GCC 4.8+)
+//   * `UNDEFINED_BEHAVIOR_SANITIZER` + `-fsanitize=undefined` (Clang, GCC 4.9+)
+//   * `CONTROL_FLOW_INTEGRITY` + -fsanitize=cfi (Clang-only)
+// -----------------------------------------------------------------------------
+
+// -----------------------------------------------------------------------------
+// A function-like feature checking macro that is a wrapper around
+// `__has_attribute`, which is defined by GCC 5+ and Clang and evaluates to a
+// nonzero constant integer if the attribute is supported or 0 if not.
+//
+// It evaluates to zero if `__has_attribute` is not defined by the compiler.
+// -----------------------------------------------------------------------------
+#ifdef __has_attribute
+    #define PHMAP_HAVE_ATTRIBUTE(x) __has_attribute(x)
+#else
+    #define PHMAP_HAVE_ATTRIBUTE(x) 0
+#endif
+
+// -----------------------------------------------------------------------------
+// A function-like feature checking macro that accepts C++11 style attributes.
+// It's a wrapper around `__has_cpp_attribute`, defined by ISO C++ SD-6
+// (https://en.cppreference.com/w/cpp/experimental/feature_test). If we don't
+// find `__has_cpp_attribute`, will evaluate to 0.
+// -----------------------------------------------------------------------------
+#if defined(__cplusplus) && defined(__has_cpp_attribute)
+    #define PHMAP_HAVE_CPP_ATTRIBUTE(x) __has_cpp_attribute(x)
+#else
+    #define PHMAP_HAVE_CPP_ATTRIBUTE(x) 0
+#endif
+
+// -----------------------------------------------------------------------------
+// Function Attributes
+// -----------------------------------------------------------------------------
+#if PHMAP_HAVE_ATTRIBUTE(format) || (defined(__GNUC__) && !defined(__clang__))
+    #define PHMAP_PRINTF_ATTRIBUTE(string_index, first_to_check) \
+      __attribute__((__format__(__printf__, string_index, first_to_check)))
+    #define PHMAP_SCANF_ATTRIBUTE(string_index, first_to_check) \
+      __attribute__((__format__(__scanf__, string_index, first_to_check)))
+#else
+    #define PHMAP_PRINTF_ATTRIBUTE(string_index, first_to_check)
+    #define PHMAP_SCANF_ATTRIBUTE(string_index, first_to_check)
+#endif
+
+#if PHMAP_HAVE_ATTRIBUTE(always_inline) || \
+    (defined(__GNUC__) && !defined(__clang__))
+    #define PHMAP_ATTRIBUTE_ALWAYS_INLINE __attribute__((always_inline))
+    #define PHMAP_HAVE_ATTRIBUTE_ALWAYS_INLINE 1
+#else
+    #define PHMAP_ATTRIBUTE_ALWAYS_INLINE
+#endif
+
+#if !defined(__INTEL_COMPILER) && (PHMAP_HAVE_ATTRIBUTE(noinline) || (defined(__GNUC__) && !defined(__clang__)))
+    #define PHMAP_ATTRIBUTE_NOINLINE __attribute__((noinline))
+    #define PHMAP_HAVE_ATTRIBUTE_NOINLINE 1
+#else
+    #define PHMAP_ATTRIBUTE_NOINLINE
+#endif
+
+#if PHMAP_HAVE_ATTRIBUTE(disable_tail_calls)
+    #define PHMAP_HAVE_ATTRIBUTE_NO_TAIL_CALL 1
+    #define PHMAP_ATTRIBUTE_NO_TAIL_CALL __attribute__((disable_tail_calls))
+#elif defined(__GNUC__) && !defined(__clang__)
+    #define PHMAP_HAVE_ATTRIBUTE_NO_TAIL_CALL 1
+    #define PHMAP_ATTRIBUTE_NO_TAIL_CALL \
+      __attribute__((optimize("no-optimize-sibling-calls")))
+#else
+    #define PHMAP_ATTRIBUTE_NO_TAIL_CALL
+    #define PHMAP_HAVE_ATTRIBUTE_NO_TAIL_CALL 0
+#endif
+
+#if (PHMAP_HAVE_ATTRIBUTE(weak) || \
+     (defined(__GNUC__) && !defined(__clang__))) && \
+    !(defined(__llvm__) && defined(_WIN32))
+    #undef PHMAP_ATTRIBUTE_WEAK
+    #define PHMAP_ATTRIBUTE_WEAK __attribute__((weak))
+    #define PHMAP_HAVE_ATTRIBUTE_WEAK 1
+#else
+    #define PHMAP_ATTRIBUTE_WEAK
+    #define PHMAP_HAVE_ATTRIBUTE_WEAK 0
+#endif
+
+#if PHMAP_HAVE_ATTRIBUTE(nonnull) || (defined(__GNUC__) && !defined(__clang__))
+    #define PHMAP_ATTRIBUTE_NONNULL(arg_index) __attribute__((nonnull(arg_index)))
+#else
+    #define PHMAP_ATTRIBUTE_NONNULL(...)
+#endif
+
+#if PHMAP_HAVE_ATTRIBUTE(noreturn) || (defined(__GNUC__) && !defined(__clang__))
+    #define PHMAP_ATTRIBUTE_NORETURN __attribute__((noreturn))
+#elif defined(_MSC_VER)
+    #define PHMAP_ATTRIBUTE_NORETURN __declspec(noreturn)
+#else
+    #define PHMAP_ATTRIBUTE_NORETURN
+#endif
+
+#if defined(__GNUC__) && defined(ADDRESS_SANITIZER)
+    #define PHMAP_ATTRIBUTE_NO_SANITIZE_ADDRESS __attribute__((no_sanitize_address))
+#else
+    #define PHMAP_ATTRIBUTE_NO_SANITIZE_ADDRESS
+#endif
+
+#if defined(__GNUC__) && defined(MEMORY_SANITIZER)
+    #define PHMAP_ATTRIBUTE_NO_SANITIZE_MEMORY __attribute__((no_sanitize_memory))
+#else
+    #define PHMAP_ATTRIBUTE_NO_SANITIZE_MEMORY
+#endif
+
+#if defined(__GNUC__) && defined(THREAD_SANITIZER)
+    #define PHMAP_ATTRIBUTE_NO_SANITIZE_THREAD __attribute__((no_sanitize_thread))
+#else
+    #define PHMAP_ATTRIBUTE_NO_SANITIZE_THREAD
+#endif
+
+#if defined(__GNUC__) && \
+    (defined(UNDEFINED_BEHAVIOR_SANITIZER) || defined(ADDRESS_SANITIZER))
+    #define PHMAP_ATTRIBUTE_NO_SANITIZE_UNDEFINED \
+      __attribute__((no_sanitize("undefined")))
+#else
+    #define PHMAP_ATTRIBUTE_NO_SANITIZE_UNDEFINED
+#endif
+
+#if defined(__GNUC__) && defined(CONTROL_FLOW_INTEGRITY)
+    #define PHMAP_ATTRIBUTE_NO_SANITIZE_CFI __attribute__((no_sanitize("cfi")))
+#else
+    #define PHMAP_ATTRIBUTE_NO_SANITIZE_CFI
+#endif
+
+#if defined(__GNUC__) && defined(SAFESTACK_SANITIZER)
+    #define PHMAP_ATTRIBUTE_NO_SANITIZE_SAFESTACK \
+      __attribute__((no_sanitize("safe-stack")))
+#else
+    #define PHMAP_ATTRIBUTE_NO_SANITIZE_SAFESTACK
+#endif
+
+#if PHMAP_HAVE_ATTRIBUTE(returns_nonnull) || \
+    (defined(__GNUC__) && \
+     (__GNUC__ > 5 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9)) && \
+     !defined(__clang__))
+    #define PHMAP_ATTRIBUTE_RETURNS_NONNULL __attribute__((returns_nonnull))
+#else
+    #define PHMAP_ATTRIBUTE_RETURNS_NONNULL
+#endif
+
+#ifdef PHMAP_HAVE_ATTRIBUTE_SECTION
+    #error PHMAP_HAVE_ATTRIBUTE_SECTION cannot be directly set
+#elif (PHMAP_HAVE_ATTRIBUTE(section) ||                \
+       (defined(__GNUC__) && !defined(__clang__))) && \
+    !defined(__APPLE__) && PHMAP_HAVE_ATTRIBUTE_WEAK
+    #define PHMAP_HAVE_ATTRIBUTE_SECTION 1
+    #ifndef PHMAP_ATTRIBUTE_SECTION
+        #define PHMAP_ATTRIBUTE_SECTION(name) \
+          __attribute__((section(#name))) __attribute__((noinline))
+    #endif
+    #ifndef PHMAP_ATTRIBUTE_SECTION_VARIABLE
+        #define PHMAP_ATTRIBUTE_SECTION_VARIABLE(name) __attribute__((section(#name)))
+    #endif
+    #ifndef PHMAP_DECLARE_ATTRIBUTE_SECTION_VARS
+        #define PHMAP_DECLARE_ATTRIBUTE_SECTION_VARS(name) \
+          extern char __start_##name[] PHMAP_ATTRIBUTE_WEAK;    \
+          extern char __stop_##name[] PHMAP_ATTRIBUTE_WEAK
+    #endif
+    #ifndef PHMAP_DEFINE_ATTRIBUTE_SECTION_VARS
+        #define PHMAP_INIT_ATTRIBUTE_SECTION_VARS(name)
+        #define PHMAP_DEFINE_ATTRIBUTE_SECTION_VARS(name)
+    #endif
+    #define PHMAP_ATTRIBUTE_SECTION_START(name) \
+      (reinterpret_cast<void *>(__start_##name))
+    #define PHMAP_ATTRIBUTE_SECTION_STOP(name) \
+      (reinterpret_cast<void *>(__stop_##name))
+#else  // !PHMAP_HAVE_ATTRIBUTE_SECTION
+    #define PHMAP_HAVE_ATTRIBUTE_SECTION 0
+    #define PHMAP_ATTRIBUTE_SECTION(name)
+    #define PHMAP_ATTRIBUTE_SECTION_VARIABLE(name)
+    #define PHMAP_INIT_ATTRIBUTE_SECTION_VARS(name)
+    #define PHMAP_DEFINE_ATTRIBUTE_SECTION_VARS(name)
+    #define PHMAP_DECLARE_ATTRIBUTE_SECTION_VARS(name)
+    #define PHMAP_ATTRIBUTE_SECTION_START(name) (reinterpret_cast<void *>(0))
+    #define PHMAP_ATTRIBUTE_SECTION_STOP(name) (reinterpret_cast<void *>(0))
+#endif  // PHMAP_ATTRIBUTE_SECTION
+
+#if PHMAP_HAVE_ATTRIBUTE(force_align_arg_pointer) || \
+    (defined(__GNUC__) && !defined(__clang__))
+    #if defined(__i386__)
+        #define PHMAP_ATTRIBUTE_STACK_ALIGN_FOR_OLD_LIBC \
+          __attribute__((force_align_arg_pointer))
+        #define PHMAP_REQUIRE_STACK_ALIGN_TRAMPOLINE (0)
+    #elif defined(__x86_64__)
+        #define PHMAP_REQUIRE_STACK_ALIGN_TRAMPOLINE (1)
+        #define PHMAP_ATTRIBUTE_STACK_ALIGN_FOR_OLD_LIBC
+    #else  // !__i386__ && !__x86_64
+        #define PHMAP_REQUIRE_STACK_ALIGN_TRAMPOLINE (0)
+        #define PHMAP_ATTRIBUTE_STACK_ALIGN_FOR_OLD_LIBC
+    #endif  // __i386__
+#else
+    #define PHMAP_ATTRIBUTE_STACK_ALIGN_FOR_OLD_LIBC
+    #define PHMAP_REQUIRE_STACK_ALIGN_TRAMPOLINE (0)
+#endif
+
+#if PHMAP_HAVE_ATTRIBUTE(nodiscard)
+    #define PHMAP_MUST_USE_RESULT [[nodiscard]]
+#elif defined(__clang__) && PHMAP_HAVE_ATTRIBUTE(warn_unused_result)
+    #define PHMAP_MUST_USE_RESULT __attribute__((warn_unused_result))
+#else
+    #define PHMAP_MUST_USE_RESULT
+#endif
+
+#if PHMAP_HAVE_ATTRIBUTE(hot) || (defined(__GNUC__) && !defined(__clang__))
+    #define PHMAP_ATTRIBUTE_HOT __attribute__((hot))
+#else
+    #define PHMAP_ATTRIBUTE_HOT
+#endif
+
+#if PHMAP_HAVE_ATTRIBUTE(cold) || (defined(__GNUC__) && !defined(__clang__))
+    #define PHMAP_ATTRIBUTE_COLD __attribute__((cold))
+#else
+    #define PHMAP_ATTRIBUTE_COLD
+#endif
+
+#if defined(__clang__)
+    #if PHMAP_HAVE_CPP_ATTRIBUTE(clang::reinitializes)
+        #define PHMAP_ATTRIBUTE_REINITIALIZES [[clang::reinitializes]]
+    #else
+        #define PHMAP_ATTRIBUTE_REINITIALIZES
+    #endif
+#else
+    #define PHMAP_ATTRIBUTE_REINITIALIZES
+#endif
+
+#if PHMAP_HAVE_ATTRIBUTE(unused) || (defined(__GNUC__) && !defined(__clang__))
+    #undef PHMAP_ATTRIBUTE_UNUSED
+    #define PHMAP_ATTRIBUTE_UNUSED __attribute__((__unused__))
+#else
+    #define PHMAP_ATTRIBUTE_UNUSED
+#endif
+
+#if PHMAP_HAVE_ATTRIBUTE(tls_model) || (defined(__GNUC__) && !defined(__clang__))
+    #define PHMAP_ATTRIBUTE_INITIAL_EXEC __attribute__((tls_model("initial-exec")))
+#else
+    #define PHMAP_ATTRIBUTE_INITIAL_EXEC
+#endif
+
+#if PHMAP_HAVE_ATTRIBUTE(packed) || (defined(__GNUC__) && !defined(__clang__))
+    #define PHMAP_ATTRIBUTE_PACKED __attribute__((__packed__))
+#else
+    #define PHMAP_ATTRIBUTE_PACKED
+#endif
+
+#if PHMAP_HAVE_ATTRIBUTE(aligned) || (defined(__GNUC__) && !defined(__clang__))
+    #define PHMAP_ATTRIBUTE_FUNC_ALIGN(bytes) __attribute__((aligned(bytes)))
+#else
+    #define PHMAP_ATTRIBUTE_FUNC_ALIGN(bytes)
+#endif
+
+// ----------------------------------------------------------------------
+// Figure out SSE support
+// ----------------------------------------------------------------------
+#ifndef PHMAP_HAVE_SSE2
+    #if defined(__SSE2__) ||  \
+        (defined(_MSC_VER) && \
+         (defined(_M_X64) || (defined(_M_IX86) && _M_IX86_FP >= 2)))
+        #define PHMAP_HAVE_SSE2 1
+    #else
+        #define PHMAP_HAVE_SSE2 0
+    #endif
+#endif
+
+#ifndef PHMAP_HAVE_SSSE3
+    #ifdef __SSSE3__
+        #define PHMAP_HAVE_SSSE3 1
+    #else
+        #define PHMAP_HAVE_SSSE3 0
+    #endif
+#endif
+
+#if PHMAP_HAVE_SSSE3 && !PHMAP_HAVE_SSE2
+    #error "Bad configuration!"
+#endif
+
+#if PHMAP_HAVE_SSE2
+    #include <emmintrin.h>
+#endif
+
+#if PHMAP_HAVE_SSSE3
+    #include <tmmintrin.h>
+#endif
+
+
+// ----------------------------------------------------------------------
+// constexpr if
+// ----------------------------------------------------------------------
+#if __cplusplus >= 201703 || (defined(_MSVC_LANG) && _MSVC_LANG >= 201703)
+    #define PHMAP_IF_CONSTEXPR(expr) if constexpr ((expr))
+#else 
+    #define PHMAP_IF_CONSTEXPR(expr) if ((expr))
+#endif
+
+// ----------------------------------------------------------------------
+// base/macros.h
+// ----------------------------------------------------------------------
+
+// PHMAP_ARRAYSIZE()
+//
+// Returns the number of elements in an array as a compile-time constant, which
+// can be used in defining new arrays. If you use this macro on a pointer by
+// mistake, you will get a compile-time error.
+#define PHMAP_ARRAYSIZE(array) \
+  (sizeof(::phmap::macros_internal::ArraySizeHelper(array)))
+
+namespace phmap {
+namespace macros_internal {
+    // Note: this internal template function declaration is used by PHMAP_ARRAYSIZE.
+    // The function doesn't need a definition, as we only use its type.
+    template <typename T, size_t N>
+    auto ArraySizeHelper(const T (&array)[N]) -> char (&)[N];
+}  // namespace macros_internal
+}  // namespace phmap
+
+// TODO(zhangxy): Use c++17 standard [[fallthrough]] macro, when supported.
+#if defined(__clang__) && defined(__has_warning)
+    #if __has_feature(cxx_attributes) && __has_warning("-Wimplicit-fallthrough")
+        #define PHMAP_FALLTHROUGH_INTENDED [[clang::fallthrough]]
+    #endif
+#elif defined(__GNUC__) && __GNUC__ >= 7
+    #define PHMAP_FALLTHROUGH_INTENDED [[gnu::fallthrough]]
+#endif
+
+#ifndef PHMAP_FALLTHROUGH_INTENDED
+    #define PHMAP_FALLTHROUGH_INTENDED \
+      do {  } while (0)
+#endif
+
+// PHMAP_DEPRECATED()
+//
+// Marks a deprecated class, struct, enum, function, method and variable
+// declarations. The macro argument is used as a custom diagnostic message (e.g.
+// suggestion of a better alternative).
+//
+// Example:
+//
+//   class PHMAP_DEPRECATED("Use Bar instead") Foo {...};
+//   PHMAP_DEPRECATED("Use Baz instead") void Bar() {...}
+//
+// Every usage of a deprecated entity will trigger a warning when compiled with
+// clang's `-Wdeprecated-declarations` option. This option is turned off by
+// default, but the warnings will be reported by clang-tidy.
+#if defined(__clang__) && __cplusplus >= 201103L
+    #define PHMAP_DEPRECATED(message) __attribute__((deprecated(message)))
+#endif
+
+#ifndef PHMAP_DEPRECATED
+    #define PHMAP_DEPRECATED(message)
+#endif
+
+// PHMAP_BAD_CALL_IF()
+//
+// Used on a function overload to trap bad calls: any call that matches the
+// overload will cause a compile-time error. This macro uses a clang-specific
+// "enable_if" attribute, as described at
+// http://clang.llvm.org/docs/AttributeReference.html#enable-if
+//
+// Overloads which use this macro should be bracketed by
+// `#ifdef PHMAP_BAD_CALL_IF`.
+//
+// Example:
+//
+//   int isdigit(int c);
+//   #ifdef PHMAP_BAD_CALL_IF
+//   int isdigit(int c)
+//     PHMAP_BAD_CALL_IF(c <= -1 || c > 255,
+//                       "'c' must have the value of an unsigned char or EOF");
+//   #endif // PHMAP_BAD_CALL_IF
+
+#if defined(__clang__)
+    #if __has_attribute(enable_if)
+        #define PHMAP_BAD_CALL_IF(expr, msg) \
+            __attribute__((enable_if(expr, "Bad call trap"), unavailable(msg)))
+    #endif
+#endif
+
+// PHMAP_ASSERT()
+//
+// In C++11, `assert` can't be used portably within constexpr functions.
+// PHMAP_ASSERT functions as a runtime assert but works in C++11 constexpr
+// functions.  Example:
+//
+// constexpr double Divide(double a, double b) {
+//   return PHMAP_ASSERT(b != 0), a / b;
+// }
+//
+// This macro is inspired by
+// https://akrzemi1.wordpress.com/2017/05/18/asserts-in-constexpr-functions/
+#if defined(NDEBUG)
+    #define PHMAP_ASSERT(expr) (false ? (void)(expr) : (void)0)
+#else
+    #define PHMAP_ASSERT(expr)              \
+      (PHMAP_PREDICT_TRUE((expr)) ? (void)0 \
+                                 : [] { assert(false && #expr); }())  // NOLINT
+#endif
+
+#ifdef PHMAP_HAVE_EXCEPTIONS
+    #define PHMAP_INTERNAL_TRY try
+    #define PHMAP_INTERNAL_CATCH_ANY catch (...)
+    #define PHMAP_INTERNAL_RETHROW do { throw; } while (false)
+#else  // PHMAP_HAVE_EXCEPTIONS
+    #define PHMAP_INTERNAL_TRY if (true)
+    #define PHMAP_INTERNAL_CATCH_ANY else if (false)
+    #define PHMAP_INTERNAL_RETHROW do {} while (false)
+#endif  // PHMAP_HAVE_EXCEPTIONS
+
+
+#endif // phmap_config_h_guard_

src/includes/3thparty/parallel_hashmap/phmap_dump.h

@@ -0,0 +1,227 @@
+#if !defined(phmap_dump_h_guard_)
+#define phmap_dump_h_guard_
+
+// ---------------------------------------------------------------------------
+// Copyright (c) 2019, Gregory Popovitch - greg7mdp@gmail.com
+//
+//       providing dump/load/mmap_load
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ---------------------------------------------------------------------------
+
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include "phmap.h"
+namespace phmap
+{
+
+namespace type_traits_internal {
+
+#if defined(__GLIBCXX__) && __GLIBCXX__ < 20150801
+    template<typename T> struct IsTriviallyCopyable : public std::integral_constant<bool, __has_trivial_copy(T)> {};
+#else
+    template<typename T> struct IsTriviallyCopyable : public std::is_trivially_copyable<T> {};
+#endif
+
+template <class T1, class T2>
+struct IsTriviallyCopyable<std::pair<T1, T2>> {
+    static constexpr bool value = IsTriviallyCopyable<T1>::value && IsTriviallyCopyable<T2>::value;
+};
+}
+
+namespace container_internal {
+
+// ------------------------------------------------------------------------
+// dump/load for raw_hash_set
+// ------------------------------------------------------------------------
+template <class Policy, class Hash, class Eq, class Alloc>
+template<typename OutputArchive>
+bool raw_hash_set<Policy, Hash, Eq, Alloc>::dump(OutputArchive& ar) {
+    static_assert(type_traits_internal::IsTriviallyCopyable<value_type>::value,
+                    "value_type should be trivially copyable");
+
+    if (!ar.dump(size_)) {
+        std::cerr << "Failed to dump size_" << std::endl;
+        return false;
+    }
+    if (size_ == 0) {
+        return true;
+    }
+    if (!ar.dump(capacity_)) {
+        std::cerr << "Failed to dump capacity_" << std::endl;
+        return false;
+    }
+    if (!ar.dump(reinterpret_cast<char*>(ctrl_),
+        sizeof(ctrl_t) * (capacity_ + Group::kWidth + 1))) {
+
+        std::cerr << "Failed to dump ctrl_" << std::endl;
+        return false;
+    }
+    if (!ar.dump(reinterpret_cast<char*>(slots_),
+                    sizeof(slot_type) * capacity_)) {
+        std::cerr << "Failed to dump slot_" << std::endl;
+        return false;
+    }
+    return true;
+}
+
+template <class Policy, class Hash, class Eq, class Alloc>
+template<typename InputArchive>
+bool raw_hash_set<Policy, Hash, Eq, Alloc>::load(InputArchive& ar) {
+    static_assert(type_traits_internal::IsTriviallyCopyable<value_type>::value,
+                    "value_type should be trivially copyable");
+    raw_hash_set<Policy, Hash, Eq, Alloc>().swap(*this); // clear any existing content
+    if (!ar.load(&size_)) {
+        std::cerr << "Failed to load size_" << std::endl;
+        return false;
+    }
+    if (size_ == 0) {
+        return true;
+    }
+    if (!ar.load(&capacity_)) {
+        std::cerr << "Failed to load capacity_" << std::endl;
+        return false;
+    }
+
+    // allocate memory for ctrl_ and slots_
+    initialize_slots();
+    if (!ar.load(reinterpret_cast<char*>(ctrl_),
+        sizeof(ctrl_t) * (capacity_ + Group::kWidth + 1))) {
+        std::cerr << "Failed to load ctrl" << std::endl;
+        return false;
+    }
+    if (!ar.load(reinterpret_cast<char*>(slots_),
+                    sizeof(slot_type) * capacity_)) {
+        std::cerr << "Failed to load slot" << std::endl;
+        return false;
+    }
+    return true;
+}
+
+// ------------------------------------------------------------------------
+// dump/load for parallel_hash_set
+// ------------------------------------------------------------------------
+template <size_t N,
+          template <class, class, class, class> class RefSet,
+          class Mtx_,
+          class Policy, class Hash, class Eq, class Alloc>
+template<typename OutputArchive>
+bool parallel_hash_set<N, RefSet, Mtx_, Policy, Hash, Eq, Alloc>::dump(OutputArchive& ar) {
+    static_assert(type_traits_internal::IsTriviallyCopyable<value_type>::value,
+                    "value_type should be trivially copyable");
+
+    if (! ar.dump(subcnt())) {
+        std::cerr << "Failed to dump meta!" << std::endl;
+        return false;
+    }
+    for (size_t i = 0; i < sets_.size(); ++i) {
+        auto& inner = sets_[i];
+        typename Lockable::UniqueLock m(const_cast<Inner&>(inner));
+        if (!inner.set_.dump(ar)) {
+            std::cerr << "Failed to dump submap " << i << std::endl;
+            return false;
+        }
+    }
+    return true;
+}
+
+template <size_t N,
+          template <class, class, class, class> class RefSet,
+          class Mtx_,
+          class Policy, class Hash, class Eq, class Alloc>
+template<typename InputArchive>
+bool parallel_hash_set<N, RefSet, Mtx_, Policy, Hash, Eq, Alloc>::load(InputArchive& ar) {
+    static_assert(type_traits_internal::IsTriviallyCopyable<value_type>::value,
+                    "value_type should be trivially copyable");
+
+    size_t submap_count = 0;
+    if (!ar.load(&submap_count)) {
+        std::cerr << "Failed to load submap count!" << std::endl;
+        return false;
+    }
+
+    if (submap_count != subcnt()) {
+        std::cerr << "submap count(" << submap_count << ") != N(" << N << ")" << std::endl;
+        return false;
+    }
+
+    for (size_t i = 0; i < submap_count; ++i) {            
+        auto& inner = sets_[i];
+        typename Lockable::UniqueLock m(const_cast<Inner&>(inner));
+        if (!inner.set_.load(ar)) {
+            std::cerr << "Failed to load submap " << i << std::endl;
+            return false;
+        }
+    }
+    return true;
+}
+} // namespace container_internal
+
+
+
+// ------------------------------------------------------------------------
+// BinaryArchive
+//       File is closed when archive object is destroyed
+// ------------------------------------------------------------------------
+
+// ------------------------------------------------------------------------
+// ------------------------------------------------------------------------
+class BinaryOutputArchive {
+public:
+    BinaryOutputArchive(const char *file_path) {
+        ofs_.open(file_path, std::ios_base::binary);
+    }
+
+    bool dump(const char *p, size_t sz) {
+        ofs_.write(p, sz);
+        return true;
+    }
+
+    template<typename V>
+    typename std::enable_if<type_traits_internal::IsTriviallyCopyable<V>::value, bool>::type
+    dump(const V& v) {
+        ofs_.write(reinterpret_cast<const char *>(&v), sizeof(V));
+        return true;
+    }
+
+private:
+    std::ofstream ofs_;
+};
+
+
+class BinaryInputArchive {
+public:
+    BinaryInputArchive(const char * file_path) {
+        ifs_.open(file_path, std::ios_base::binary);
+    }
+
+    bool load(char* p, size_t sz) {
+        ifs_.read(p, sz);
+        return true;
+    }
+
+    template<typename V>
+    typename std::enable_if<type_traits_internal::IsTriviallyCopyable<V>::value, bool>::type
+    load(V* v) {
+        ifs_.read(reinterpret_cast<char *>(v), sizeof(V));
+        return true;
+    }
+
+private:
+    std::ifstream ifs_;
+};
+
+} // namespace phmap
+
+#endif // phmap_dump_h_guard_

src/includes/3thparty/parallel_hashmap/phmap_fwd_decl.h

@@ -0,0 +1,154 @@
+#if !defined(phmap_fwd_decl_h_guard_)
+#define phmap_fwd_decl_h_guard_
+
+// ---------------------------------------------------------------------------
+// Copyright (c) 2019, Gregory Popovitch - greg7mdp@gmail.com
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+// ---------------------------------------------------------------------------
+
+#ifdef _MSC_VER
+    #pragma warning(push)  
+    #pragma warning(disable : 4514) // unreferenced inline function has been removed
+    #pragma warning(disable : 4710) // function not inlined
+    #pragma warning(disable : 4711) // selected for automatic inline expansion
+#endif
+
+#include <memory>
+#include <utility>
+
+#if defined(PHMAP_USE_ABSL_HASH)
+    namespace absl { template <class T> struct Hash; };
+#endif
+
+namespace phmap {
+
+#if defined(PHMAP_USE_ABSL_HASH)
+    template <class T> using Hash = absl::Hash<T>;
+#else
+    template <class T> struct Hash;
+#endif
+
+    template <class T> struct EqualTo;
+    template <class T> struct Less;
+    template <class T> using Allocator      = typename std::allocator<T>;
+    template<class T1, class T2> using Pair = typename std::pair<T1, T2>;
+
+    class NullMutex;
+
+    namespace container_internal {
+
+        // The hash of an object of type T is computed by using phmap::Hash.
+        template <class T, class E = void>
+        struct HashEq 
+        {
+            using Hash = phmap::Hash<T>;
+            using Eq   = phmap::EqualTo<T>;
+        };
+
+        template <class T>
+        using hash_default_hash = typename container_internal::HashEq<T>::Hash;
+
+        template <class T>
+        using hash_default_eq = typename container_internal::HashEq<T>::Eq;
+
+        // type alias for std::allocator so we can forward declare without including other headers
+        template <class T>  
+        using Allocator = typename phmap::Allocator<T>;
+
+        // type alias for std::pair so we can forward declare without including other headers
+        template<class T1, class T2> 
+        using Pair = typename phmap::Pair<T1, T2>;
+
+    }  // namespace container_internal
+
+    // ------------- forward declarations for hash containers ----------------------------------
+    template <class T, 
+              class Hash  = phmap::container_internal::hash_default_hash<T>,
+              class Eq    = phmap::container_internal::hash_default_eq<T>,
+              class Alloc = phmap::container_internal::Allocator<T>>  // alias for std::allocator
+        class flat_hash_set;
+
+    template <class K, class V,
+              class Hash  = phmap::container_internal::hash_default_hash<K>,
+              class Eq    = phmap::container_internal::hash_default_eq<K>,
+              class Alloc = phmap::container_internal::Allocator<
+                            phmap::container_internal::Pair<const K, V>>> // alias for std::allocator
+        class flat_hash_map;
+    
+    template <class T, 
+              class Hash  = phmap::container_internal::hash_default_hash<T>,
+              class Eq    = phmap::container_internal::hash_default_eq<T>,
+              class Alloc = phmap::container_internal::Allocator<T>> // alias for std::allocator
+        class node_hash_set;
+
+    template <class Key, class Value,
+              class Hash  = phmap::container_internal::hash_default_hash<Key>,
+              class Eq    = phmap::container_internal::hash_default_eq<Key>,
+              class Alloc = phmap::container_internal::Allocator<
+                            phmap::container_internal::Pair<const Key, Value>>> // alias for std::allocator
+        class node_hash_map;
+
+    template <class T,
+              class Hash  = phmap::container_internal::hash_default_hash<T>,
+              class Eq    = phmap::container_internal::hash_default_eq<T>,
+              class Alloc = phmap::container_internal::Allocator<T>, // alias for std::allocator
+              size_t N    = 4,                  // 2**N submaps
+              class Mutex = phmap::NullMutex>   // use std::mutex to enable internal locks
+        class parallel_flat_hash_set;
+
+    template <class K, class V,
+              class Hash  = phmap::container_internal::hash_default_hash<K>,
+              class Eq    = phmap::container_internal::hash_default_eq<K>,
+              class Alloc = phmap::container_internal::Allocator<
+                            phmap::container_internal::Pair<const K, V>>, // alias for std::allocator
+              size_t N    = 4,                  // 2**N submaps
+              class Mutex = phmap::NullMutex>   // use std::mutex to enable internal locks
+        class parallel_flat_hash_map;
+
+    template <class T, 
+              class Hash  = phmap::container_internal::hash_default_hash<T>,
+              class Eq    = phmap::container_internal::hash_default_eq<T>,
+              class Alloc = phmap::container_internal::Allocator<T>, // alias for std::allocator
+              size_t N    = 4,                  // 2**N submaps
+              class Mutex = phmap::NullMutex>   // use std::mutex to enable internal locks
+        class parallel_node_hash_set;
+
+    template <class Key, class Value,
+              class Hash  = phmap::container_internal::hash_default_hash<Key>,
+              class Eq    = phmap::container_internal::hash_default_eq<Key>,
+              class Alloc = phmap::container_internal::Allocator<
+                            phmap::container_internal::Pair<const Key, Value>>, // alias for std::allocator
+              size_t N    = 4,                  // 2**N submaps
+              class Mutex = phmap::NullMutex>   // use std::mutex to enable internal locks
+        class parallel_node_hash_map;
+
+    // ------------- forward declarations for btree containers ----------------------------------
+    template <typename Key, typename Compare = phmap::Less<Key>,
+              typename Alloc = phmap::Allocator<Key>>
+        class btree_set;
+
+    template <typename Key, typename Compare = phmap::Less<Key>,
+              typename Alloc = phmap::Allocator<Key>>
+        class btree_multiset;
+
+    template <typename Key, typename Value, typename Compare = phmap::Less<Key>,
+              typename Alloc = phmap::Allocator<phmap::container_internal::Pair<const Key, Value>>>
+        class btree_map;
+    
+    template <typename Key, typename Value, typename Compare = phmap::Less<Key>,
+              typename Alloc = phmap::Allocator<phmap::container_internal::Pair<const Key, Value>>>
+        class btree_multimap;
+
+}  // namespace phmap
+
+
+#ifdef _MSC_VER
+     #pragma warning(pop)  
+#endif
+
+#endif // phmap_fwd_decl_h_guard_

src/includes/3thparty/parallel_hashmap/phmap_utils.h

@@ -0,0 +1,370 @@
+#if !defined(phmap_utils_h_guard_)
+#define phmap_utils_h_guard_
+
+// ---------------------------------------------------------------------------
+// Copyright (c) 2019, Gregory Popovitch - greg7mdp@gmail.com
+//
+//       minimal header providing phmap::HashState
+//
+//       use as:  phmap::HashState().combine(0, _first_name, _last_name, _age);
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ---------------------------------------------------------------------------
+
+#ifdef _MSC_VER
+    #pragma warning(push)  
+    #pragma warning(disable : 4514) // unreferenced inline function has been removed
+    #pragma warning(disable : 4710) // function not inlined
+    #pragma warning(disable : 4711) // selected for automatic inline expansion
+#endif
+
+#include <cstdint>
+#include <functional>
+#include <tuple>
+#include "phmap_bits.h"
+
+namespace phmap
+{
+
+// ---------------------------------------------------------------
+// ---------------------------------------------------------------
+template<int n> 
+struct phmap_mix
+{
+    inline size_t operator()(size_t) const;
+};
+
+template<>
+struct phmap_mix<4>
+{
+    inline size_t operator()(size_t a) const
+    {
+        static constexpr uint64_t kmul = 0xcc9e2d51UL;
+        // static constexpr uint64_t kmul = 0x3B9ACB93UL; // [greg] my own random prime
+        uint64_t l = a * kmul;
+        return static_cast<size_t>(l ^ (l >> 32));
+    }
+};
+
+#if defined(PHMAP_HAS_UMUL128)
+    template<>
+    struct phmap_mix<8>
+    {
+        // Very fast mixing (similar to Abseil)
+        inline size_t operator()(size_t a) const
+        {
+            static constexpr uint64_t k = 0xde5fb9d2630458e9ULL;
+            // static constexpr uint64_t k = 0x7C9D0BF0567102A5ULL; // [greg] my own random prime
+            uint64_t h;
+            uint64_t l = umul128(a, k, &h);
+            return static_cast<size_t>(h + l);
+        }
+    };
+#else
+    template<>
+    struct phmap_mix<8>
+    {
+        inline size_t operator()(size_t a) const
+        {
+            a = (~a) + (a << 21); // a = (a << 21) - a - 1;
+            a = a ^ (a >> 24);
+            a = (a + (a << 3)) + (a << 8); // a * 265
+            a = a ^ (a >> 14);
+            a = (a + (a << 2)) + (a << 4); // a * 21
+            a = a ^ (a >> 28);
+            a = a + (a << 31);
+            return static_cast<size_t>(a);
+        }
+    };
+#endif
+
+// --------------------------------------------
+template<int n> 
+struct fold_if_needed
+{
+    inline size_t operator()(uint64_t) const;
+};
+
+template<>
+struct fold_if_needed<4>
+{
+    inline size_t operator()(uint64_t a) const
+    {
+        return static_cast<size_t>(a ^ (a >> 32));
+    }
+};
+
+template<>
+struct fold_if_needed<8>
+{
+    inline size_t operator()(uint64_t a) const
+    {
+        return static_cast<size_t>(a);
+    }
+};
+
+// ---------------------------------------------------------------
+// see if class T has a hash_value() friend method
+// ---------------------------------------------------------------
+template<typename T>
+struct has_hash_value
+{
+private:
+    typedef std::true_type yes;
+    typedef std::false_type no;
+
+    template<typename U> static auto test(int) -> decltype(hash_value(std::declval<U&>()) == 1, yes());
+
+    template<typename> static no test(...);
+
+public:
+    static constexpr bool value = std::is_same<decltype(test<T>(0)), yes>::value;
+};
+
+#if defined(PHMAP_USE_ABSL_HASH) && !defined(phmap_fwd_decl_h_guard_)
+    namespace absl { template <class T> struct Hash; };
+    template <class T> using Hash = absl::Hash<T>;
+#else
+// ---------------------------------------------------------------
+//               phmap::Hash
+// ---------------------------------------------------------------
+template <class T>
+struct Hash
+{
+    template <class U, typename std::enable_if<has_hash_value<U>::value, int>::type = 0>
+    size_t _hash(const T& val) const
+    {
+        return hash_value(val);
+    }
+ 
+    template <class U, typename std::enable_if<!has_hash_value<U>::value, int>::type = 0>
+    size_t _hash(const T& val) const
+    {
+        return std::hash<T>()(val);
+    }
+ 
+    inline size_t operator()(const T& val) const
+    {
+        return _hash<T>(val);
+    }
+};
+
+template <class T>
+struct Hash<T *>
+{
+    inline size_t operator()(const T *val) const noexcept
+    {
+        return static_cast<size_t>(reinterpret_cast<const uintptr_t>(val)); 
+    }
+};
+
+template<class ArgumentType, class ResultType>
+struct phmap_unary_function
+{
+    typedef ArgumentType argument_type;
+    typedef ResultType result_type;
+};
+
+template <>
+struct Hash<bool> : public phmap_unary_function<bool, size_t>
+{
+    inline size_t operator()(bool val) const noexcept
+    { return static_cast<size_t>(val); }
+};
+
+template <>
+struct Hash<char> : public phmap_unary_function<char, size_t>
+{
+    inline size_t operator()(char val) const noexcept
+    { return static_cast<size_t>(val); }
+};
+
+template <>
+struct Hash<signed char> : public phmap_unary_function<signed char, size_t>
+{
+    inline size_t operator()(signed char val) const noexcept
+    { return static_cast<size_t>(val); }
+};
+
+template <>
+struct Hash<unsigned char> : public phmap_unary_function<unsigned char, size_t>
+{
+    inline size_t operator()(unsigned char val) const noexcept
+    { return static_cast<size_t>(val); }
+};
+
+template <>
+struct Hash<wchar_t> : public phmap_unary_function<wchar_t, size_t>
+{
+    inline size_t operator()(wchar_t val) const noexcept
+    { return static_cast<size_t>(val); }
+};
+
+template <>
+struct Hash<int16_t> : public phmap_unary_function<int16_t, size_t>
+{
+    inline size_t operator()(int16_t val) const noexcept
+    { return static_cast<size_t>(val); }
+};
+
+template <>
+struct Hash<uint16_t> : public phmap_unary_function<uint16_t, size_t>
+{
+    inline size_t operator()(uint16_t val) const noexcept
+    { return static_cast<size_t>(val); }
+};
+
+template <>
+struct Hash<int32_t> : public phmap_unary_function<int32_t, size_t>
+{
+    inline size_t operator()(int32_t val) const noexcept
+    { return static_cast<size_t>(val); }
+};
+
+template <>
+struct Hash<uint32_t> : public phmap_unary_function<uint32_t, size_t>
+{
+    inline size_t operator()(uint32_t val) const noexcept
+    { return static_cast<size_t>(val); }
+};
+
+template <>
+struct Hash<int64_t> : public phmap_unary_function<int64_t, size_t>
+{
+    inline size_t operator()(int64_t val) const noexcept
+    { return fold_if_needed<sizeof(size_t)>()(static_cast<uint64_t>(val)); }
+};
+
+template <>
+struct Hash<uint64_t> : public phmap_unary_function<uint64_t, size_t>
+{
+    inline size_t operator()(uint64_t val) const noexcept
+    { return fold_if_needed<sizeof(size_t)>()(val); }
+};
+
+template <>
+struct Hash<float> : public phmap_unary_function<float, size_t>
+{
+    inline size_t operator()(float val) const noexcept
+    {
+        // -0.0 and 0.0 should return same hash
+        uint32_t *as_int = reinterpret_cast<uint32_t *>(&val);
+        return (val == 0) ? static_cast<size_t>(0) : 
+                            static_cast<size_t>(*as_int);
+    }
+};
+
+template <>
+struct Hash<double> : public phmap_unary_function<double, size_t>
+{
+    inline size_t operator()(double val) const noexcept
+    {
+        // -0.0 and 0.0 should return same hash
+        uint64_t *as_int = reinterpret_cast<uint64_t *>(&val);
+        return (val == 0) ? static_cast<size_t>(0) : 
+                            fold_if_needed<sizeof(size_t)>()(*as_int);
+    }
+};
+
+#endif
+
+template <class H, int sz> struct Combiner
+{
+    H operator()(H seed, size_t value);
+};
+
+template <class H> struct Combiner<H, 4>
+{
+    H operator()(H seed, size_t value)
+    {
+        return seed ^ (value + 0x9e3779b9 + (seed << 6) + (seed >> 2));
+    }
+};
+
+template <class H> struct Combiner<H, 8>
+{
+    H operator()(H seed, size_t value)
+    {
+        return seed ^ (value + size_t(0xc6a4a7935bd1e995) + (seed << 6) + (seed >> 2));
+    }
+};
+
+// define HashState to combine member hashes... see example below
+// -----------------------------------------------------------------------------
+template <typename H>
+class HashStateBase {
+public:
+    template <typename T, typename... Ts>
+    static H combine(H state, const T& value, const Ts&... values);
+
+    static H combine(H state) { return state; }
+};
+
+template <typename H>
+template <typename T, typename... Ts>
+H HashStateBase<H>::combine(H seed, const T& v, const Ts&... vs)
+{
+    return HashStateBase<H>::combine(Combiner<H, sizeof(H)>()(
+                                         seed, phmap::Hash<T>()(v)), 
+                                     vs...);
+}
+
+using HashState = HashStateBase<size_t>;
+
+// -----------------------------------------------------------------------------
+
+#if !defined(PHMAP_USE_ABSL_HASH)
+
+// define Hash for std::pair
+// -------------------------
+template<class T1, class T2> 
+struct Hash<std::pair<T1, T2>> {
+    size_t operator()(std::pair<T1, T2> const& p) const noexcept {
+        return phmap::HashState().combine(phmap::Hash<T1>()(p.first), p.second);
+    }
+};
+
+// define Hash for std::tuple
+// --------------------------
+template<class... T> 
+struct Hash<std::tuple<T...>> {
+    size_t operator()(std::tuple<T...> const& t) const noexcept {
+        return _hash_helper(t);
+    }
+
+private:
+    template<size_t I = 0, class ...P>
+        typename std::enable_if<I == sizeof...(P), size_t>::type
+        _hash_helper(const std::tuple<P...> &) const noexcept { return 0; }
+
+    template<size_t I = 0, class ...P>
+    typename std::enable_if<I < sizeof...(P), size_t>::type
+    _hash_helper(const std::tuple<P...> &t) const noexcept {
+        const auto &el = std::get<I>(t);
+        using el_type = typename std::remove_cv<typename std::remove_reference<decltype(el)>::type>::type;
+        return Combiner<size_t, sizeof(size_t)>()(
+            phmap::Hash<el_type>()(el),  _hash_helper<I + 1>(t));
+    }
+};
+
+
+#endif
+
+
+}  // namespace phmap
+
+#ifdef _MSC_VER
+     #pragma warning(pop)  
+#endif
+
+#endif // phmap_utils_h_guard_

src/includes/3thparty/skarupke

@@ -0,0 +1 @@
+Subproject commit 2c4687431f978f02a3780e24b8b701d22aa32d9c

src/includes/3thparty/sparsehash/dense_hash_map

@@ -0,0 +1,369 @@
+// Copyright (c) 2005, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ----
+//
+// This is just a very thin wrapper over densehashtable.h, just
+// like sgi stl's stl_hash_map is a very thin wrapper over
+// stl_hashtable.  The major thing we define is operator[], because
+// we have a concept of a data_type which stl_hashtable doesn't
+// (it only has a key and a value).
+//
+// NOTE: this is exactly like sparse_hash_map.h, with the word
+// "sparse" replaced by "dense", except for the addition of
+// set_empty_key().
+//
+//   YOU MUST CALL SET_EMPTY_KEY() IMMEDIATELY AFTER CONSTRUCTION.
+//
+// Otherwise your program will die in mysterious ways.  (Note if you
+// use the constructor that takes an InputIterator range, you pass in
+// the empty key in the constructor, rather than after.  As a result,
+// this constructor differs from the standard STL version.)
+//
+// In other respects, we adhere mostly to the STL semantics for
+// hash-map.  One important exception is that insert() may invalidate
+// iterators entirely -- STL semantics are that insert() may reorder
+// iterators, but they all still refer to something valid in the
+// hashtable.  Not so for us.  Likewise, insert() may invalidate
+// pointers into the hashtable.  (Whether insert invalidates iterators
+// and pointers depends on whether it results in a hashtable resize).
+// On the plus side, delete() doesn't invalidate iterators or pointers
+// at all, or even change the ordering of elements.
+//
+// Here are a few "power user" tips:
+//
+//    1) set_deleted_key():
+//         If you want to use erase() you *must* call set_deleted_key(),
+//         in addition to set_empty_key(), after construction.
+//         The deleted and empty keys must differ.
+//
+//    2) resize(0):
+//         When an item is deleted, its memory isn't freed right
+//         away.  This allows you to iterate over a hashtable,
+//         and call erase(), without invalidating the iterator.
+//         To force the memory to be freed, call resize(0).
+//         For tr1 compatibility, this can also be called as rehash(0).
+//
+//    3) min_load_factor(0.0)
+//         Setting the minimum load factor to 0.0 guarantees that
+//         the hash table will never shrink.
+//
+// Roughly speaking:
+//   (1) dense_hash_map: fastest, uses the most memory unless entries are small
+//   (2) sparse_hash_map: slowest, uses the least memory
+//   (3) hash_map / unordered_map (STL): in the middle
+//
+// Typically I use sparse_hash_map when I care about space and/or when
+// I need to save the hashtable on disk.  I use hash_map otherwise.  I
+// don't personally use dense_hash_set ever; some people use it for
+// small sets with lots of lookups.
+//
+// - dense_hash_map has, typically, about 78% memory overhead (if your
+//   data takes up X bytes, the hash_map uses .78X more bytes in overhead).
+// - sparse_hash_map has about 4 bits overhead per entry.
+// - sparse_hash_map can be 3-7 times slower than the others for lookup and,
+//   especially, inserts.  See time_hash_map.cc for details.
+//
+// See /usr/(local/)?doc/sparsehash-*/dense_hash_map.html
+// for information about how to use this class.
+
+#ifndef _DENSE_HASH_MAP_H_
+#define _DENSE_HASH_MAP_H_
+
+#include "./internal/sparseconfig.h"
+#include <algorithm>                        // needed by stl_alloc
+#include <functional>                       // for equal_to<>, select1st<>, etc
+#include <memory>                           // for alloc
+#include <utility>                          // for pair<>
+#include "./internal/densehashtable.h"        // IWYU pragma: export
+#include "./internal/libc_allocator_with_realloc.h"
+#include HASH_FUN_H                 // for hash<>
+_START_GOOGLE_NAMESPACE_
+
+template <class Key, class T,
+          class HashFcn = SPARSEHASH_HASH<Key>,   // defined in sparseconfig.h
+          class EqualKey = std::equal_to<Key>,
+          class Alloc = libc_allocator_with_realloc<std::pair<const Key, T> > >
+class dense_hash_map {
+ private:
+  // Apparently select1st is not stl-standard, so we define our own
+  struct SelectKey {
+    typedef const Key& result_type;
+    const Key& operator()(const std::pair<const Key, T>& p) const {
+      return p.first;
+    }
+  };
+  struct SetKey {
+    void operator()(std::pair<const Key, T>* value, const Key& new_key) const {
+      *const_cast<Key*>(&value->first) = new_key;
+      // It would be nice to clear the rest of value here as well, in
+      // case it's taking up a lot of memory.  We do this by clearing
+      // the value.  This assumes T has a zero-arg constructor!
+      value->second = T();
+    }
+  };
+  // For operator[].
+  struct DefaultValue {
+    std::pair<const Key, T> operator()(const Key& key) {
+      return std::make_pair(key, T());
+    }
+  };
+
+  // The actual data
+  typedef dense_hashtable<std::pair<const Key, T>, Key, HashFcn, SelectKey,
+                          SetKey, EqualKey, Alloc> ht;
+  ht rep;
+
+ public:
+  typedef typename ht::key_type key_type;
+  typedef T data_type;
+  typedef T mapped_type;
+  typedef typename ht::value_type value_type;
+  typedef typename ht::hasher hasher;
+  typedef typename ht::key_equal key_equal;
+  typedef Alloc allocator_type;
+
+  typedef typename ht::size_type size_type;
+  typedef typename ht::difference_type difference_type;
+  typedef typename ht::pointer pointer;
+  typedef typename ht::const_pointer const_pointer;
+  typedef typename ht::reference reference;
+  typedef typename ht::const_reference const_reference;
+
+  typedef typename ht::iterator iterator;
+  typedef typename ht::const_iterator const_iterator;
+  typedef typename ht::local_iterator local_iterator;
+  typedef typename ht::const_local_iterator const_local_iterator;
+
+  // Iterator functions
+  iterator begin()                               { return rep.begin(); }
+  iterator end()                                 { return rep.end(); }
+  const_iterator begin() const                   { return rep.begin(); }
+  const_iterator end() const                     { return rep.end(); }
+
+
+  // These come from tr1's unordered_map. For us, a bucket has 0 or 1 elements.
+  local_iterator begin(size_type i)              { return rep.begin(i); }
+  local_iterator end(size_type i)                { return rep.end(i); }
+  const_local_iterator begin(size_type i) const  { return rep.begin(i); }
+  const_local_iterator end(size_type i) const    { return rep.end(i); }
+
+  // Accessor functions
+  allocator_type get_allocator() const           { return rep.get_allocator(); }
+  hasher hash_funct() const                      { return rep.hash_funct(); }
+  hasher hash_function() const                   { return hash_funct(); }
+  key_equal key_eq() const                       { return rep.key_eq(); }
+
+
+  // Constructors
+  explicit dense_hash_map(size_type expected_max_items_in_table = 0,
+                          const hasher& hf = hasher(),
+                          const key_equal& eql = key_equal(),
+                          const allocator_type& alloc = allocator_type())
+    : rep(expected_max_items_in_table, hf, eql, SelectKey(), SetKey(), alloc) {
+  }
+
+  template <class InputIterator>
+  dense_hash_map(InputIterator f, InputIterator l,
+                 const key_type& empty_key_val,
+                 size_type expected_max_items_in_table = 0,
+                 const hasher& hf = hasher(),
+                 const key_equal& eql = key_equal(),
+                 const allocator_type& alloc = allocator_type())
+    : rep(expected_max_items_in_table, hf, eql, SelectKey(), SetKey(), alloc) {
+    set_empty_key(empty_key_val);
+    rep.insert(f, l);
+  }
+  // We use the default copy constructor
+  // We use the default operator=()
+  // We use the default destructor
+
+  void clear()                        { rep.clear(); }
+  // This clears the hash map without resizing it down to the minimum
+  // bucket count, but rather keeps the number of buckets constant
+  void clear_no_resize()              { rep.clear_no_resize(); }
+  void swap(dense_hash_map& hs)       { rep.swap(hs.rep); }
+
+
+  // Functions concerning size
+  size_type size() const              { return rep.size(); }
+  size_type max_size() const          { return rep.max_size(); }
+  bool empty() const                  { return rep.empty(); }
+  size_type bucket_count() const      { return rep.bucket_count(); }
+  size_type max_bucket_count() const  { return rep.max_bucket_count(); }
+
+  // These are tr1 methods.  bucket() is the bucket the key is or would be in.
+  size_type bucket_size(size_type i) const    { return rep.bucket_size(i); }
+  size_type bucket(const key_type& key) const { return rep.bucket(key); }
+  float load_factor() const {
+    return size() * 1.0f / bucket_count();
+  }
+  float max_load_factor() const {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    return grow;
+  }
+  void max_load_factor(float new_grow) {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    rep.set_resizing_parameters(shrink, new_grow);
+  }
+  // These aren't tr1 methods but perhaps ought to be.
+  float min_load_factor() const {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    return shrink;
+  }
+  void min_load_factor(float new_shrink) {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    rep.set_resizing_parameters(new_shrink, grow);
+  }
+  // Deprecated; use min_load_factor() or max_load_factor() instead.
+  void set_resizing_parameters(float shrink, float grow) {
+    rep.set_resizing_parameters(shrink, grow);
+  }
+
+  void resize(size_type hint)         { rep.resize(hint); }
+  void rehash(size_type hint)         { resize(hint); }      // the tr1 name
+
+  // Lookup routines
+  iterator find(const key_type& key)                 { return rep.find(key); }
+  const_iterator find(const key_type& key) const     { return rep.find(key); }
+
+  data_type& operator[](const key_type& key) {       // This is our value-add!
+    // If key is in the hashtable, returns find(key)->second,
+    // otherwise returns insert(value_type(key, T()).first->second.
+    // Note it does not create an empty T unless the find fails.
+    return rep.template find_or_insert<DefaultValue>(key).second;
+  }
+
+  size_type count(const key_type& key) const         { return rep.count(key); }
+
+  std::pair<iterator, iterator> equal_range(const key_type& key) {
+    return rep.equal_range(key);
+  }
+  std::pair<const_iterator, const_iterator> equal_range(const key_type& key)
+      const {
+    return rep.equal_range(key);
+  }
+
+
+  // Insertion routines
+  std::pair<iterator, bool> insert(const value_type& obj) {
+    return rep.insert(obj);
+  }
+  template <class InputIterator> void insert(InputIterator f, InputIterator l) {
+    rep.insert(f, l);
+  }
+  void insert(const_iterator f, const_iterator l) {
+    rep.insert(f, l);
+  }
+  // Required for std::insert_iterator; the passed-in iterator is ignored.
+  iterator insert(iterator, const value_type& obj) {
+    return insert(obj).first;
+  }
+
+  // Deletion and empty routines
+  // THESE ARE NON-STANDARD!  I make you specify an "impossible" key
+  // value to identify deleted and empty buckets.  You can change the
+  // deleted key as time goes on, or get rid of it entirely to be insert-only.
+  void set_empty_key(const key_type& key)   {           // YOU MUST CALL THIS!
+    rep.set_empty_key(value_type(key, data_type()));    // rep wants a value
+  }
+  key_type empty_key() const {
+    return rep.empty_key().first;                       // rep returns a value
+  }
+
+  void set_deleted_key(const key_type& key)   { rep.set_deleted_key(key); }
+  void clear_deleted_key()                    { rep.clear_deleted_key(); }
+  key_type deleted_key() const                { return rep.deleted_key(); }
+
+  // These are standard
+  size_type erase(const key_type& key)               { return rep.erase(key); }
+  void erase(iterator it)                            { rep.erase(it); }
+  void erase(iterator f, iterator l)                 { rep.erase(f, l); }
+
+
+  // Comparison
+  bool operator==(const dense_hash_map& hs) const    { return rep == hs.rep; }
+  bool operator!=(const dense_hash_map& hs) const    { return rep != hs.rep; }
+
+
+  // I/O -- this is an add-on for writing hash map to disk
+  //
+  // For maximum flexibility, this does not assume a particular
+  // file type (though it will probably be a FILE *).  We just pass
+  // the fp through to rep.
+
+  // If your keys and values are simple enough, you can pass this
+  // serializer to serialize()/unserialize().  "Simple enough" means
+  // value_type is a POD type that contains no pointers.  Note,
+  // however, we don't try to normalize endianness.
+  typedef typename ht::NopointerSerializer NopointerSerializer;
+
+  // serializer: a class providing operator()(OUTPUT*, const value_type&)
+  //    (writing value_type to OUTPUT).  You can specify a
+  //    NopointerSerializer object if appropriate (see above).
+  // fp: either a FILE*, OR an ostream*/subclass_of_ostream*, OR a
+  //    pointer to a class providing size_t Write(const void*, size_t),
+  //    which writes a buffer into a stream (which fp presumably
+  //    owns) and returns the number of bytes successfully written.
+  //    Note basic_ostream<not_char> is not currently supported.
+  template <typename ValueSerializer, typename OUTPUT>
+  bool serialize(ValueSerializer serializer, OUTPUT* fp) {
+    return rep.serialize(serializer, fp);
+  }
+
+  // serializer: a functor providing operator()(INPUT*, value_type*)
+  //    (reading from INPUT and into value_type).  You can specify a
+  //    NopointerSerializer object if appropriate (see above).
+  // fp: either a FILE*, OR an istream*/subclass_of_istream*, OR a
+  //    pointer to a class providing size_t Read(void*, size_t),
+  //    which reads into a buffer from a stream (which fp presumably
+  //    owns) and returns the number of bytes successfully read.
+  //    Note basic_istream<not_char> is not currently supported.
+  // NOTE: Since value_type is std::pair<const Key, T>, ValueSerializer
+  // may need to do a const cast in order to fill in the key.
+  template <typename ValueSerializer, typename INPUT>
+  bool unserialize(ValueSerializer serializer, INPUT* fp) {
+    return rep.unserialize(serializer, fp);
+  }
+};
+
+// We need a global swap as well
+template <class Key, class T, class HashFcn, class EqualKey, class Alloc>
+inline void swap(dense_hash_map<Key, T, HashFcn, EqualKey, Alloc>& hm1,
+                 dense_hash_map<Key, T, HashFcn, EqualKey, Alloc>& hm2) {
+  hm1.swap(hm2);
+}
+
+_END_GOOGLE_NAMESPACE_
+
+#endif /* _DENSE_HASH_MAP_H_ */

src/includes/3thparty/sparsehash/dense_hash_set

@@ -0,0 +1,338 @@
+// Copyright (c) 2005, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ---
+//
+// This is just a very thin wrapper over densehashtable.h, just
+// like sgi stl's stl_hash_set is a very thin wrapper over
+// stl_hashtable.  The major thing we define is operator[], because
+// we have a concept of a data_type which stl_hashtable doesn't
+// (it only has a key and a value).
+//
+// This is more different from dense_hash_map than you might think,
+// because all iterators for sets are const (you obviously can't
+// change the key, and for sets there is no value).
+//
+// NOTE: this is exactly like sparse_hash_set.h, with the word
+// "sparse" replaced by "dense", except for the addition of
+// set_empty_key().
+//
+//   YOU MUST CALL SET_EMPTY_KEY() IMMEDIATELY AFTER CONSTRUCTION.
+//
+// Otherwise your program will die in mysterious ways.  (Note if you
+// use the constructor that takes an InputIterator range, you pass in
+// the empty key in the constructor, rather than after.  As a result,
+// this constructor differs from the standard STL version.)
+//
+// In other respects, we adhere mostly to the STL semantics for
+// hash-map.  One important exception is that insert() may invalidate
+// iterators entirely -- STL semantics are that insert() may reorder
+// iterators, but they all still refer to something valid in the
+// hashtable.  Not so for us.  Likewise, insert() may invalidate
+// pointers into the hashtable.  (Whether insert invalidates iterators
+// and pointers depends on whether it results in a hashtable resize).
+// On the plus side, delete() doesn't invalidate iterators or pointers
+// at all, or even change the ordering of elements.
+//
+// Here are a few "power user" tips:
+//
+//    1) set_deleted_key():
+//         If you want to use erase() you must call set_deleted_key(),
+//         in addition to set_empty_key(), after construction.
+//         The deleted and empty keys must differ.
+//
+//    2) resize(0):
+//         When an item is deleted, its memory isn't freed right
+//         away.  This allows you to iterate over a hashtable,
+//         and call erase(), without invalidating the iterator.
+//         To force the memory to be freed, call resize(0).
+//         For tr1 compatibility, this can also be called as rehash(0).
+//
+//    3) min_load_factor(0.0)
+//         Setting the minimum load factor to 0.0 guarantees that
+//         the hash table will never shrink.
+//
+// Roughly speaking:
+//   (1) dense_hash_set: fastest, uses the most memory unless entries are small
+//   (2) sparse_hash_set: slowest, uses the least memory
+//   (3) hash_set / unordered_set (STL): in the middle
+//
+// Typically I use sparse_hash_set when I care about space and/or when
+// I need to save the hashtable on disk.  I use hash_set otherwise.  I
+// don't personally use dense_hash_set ever; some people use it for
+// small sets with lots of lookups.
+//
+// - dense_hash_set has, typically, about 78% memory overhead (if your
+//   data takes up X bytes, the hash_set uses .78X more bytes in overhead).
+// - sparse_hash_set has about 4 bits overhead per entry.
+// - sparse_hash_set can be 3-7 times slower than the others for lookup and,
+//   especially, inserts.  See time_hash_map.cc for details.
+//
+// See /usr/(local/)?doc/sparsehash-*/dense_hash_set.html
+// for information about how to use this class.
+
+#ifndef _DENSE_HASH_SET_H_
+#define _DENSE_HASH_SET_H_
+
+#include <sparsehash/internal/sparseconfig.h>
+#include <algorithm>                        // needed by stl_alloc
+#include <functional>                       // for equal_to<>, select1st<>, etc
+#include <memory>                           // for alloc
+#include <utility>                          // for pair<>
+#include <sparsehash/internal/densehashtable.h>        // IWYU pragma: export
+#include <sparsehash/internal/libc_allocator_with_realloc.h>
+#include HASH_FUN_H                 // for hash<>
+_START_GOOGLE_NAMESPACE_
+
+template <class Value,
+          class HashFcn = SPARSEHASH_HASH<Value>,   // defined in sparseconfig.h
+          class EqualKey = std::equal_to<Value>,
+          class Alloc = libc_allocator_with_realloc<Value> >
+class dense_hash_set {
+ private:
+  // Apparently identity is not stl-standard, so we define our own
+  struct Identity {
+    typedef const Value& result_type;
+    const Value& operator()(const Value& v) const { return v; }
+  };
+  struct SetKey {
+    void operator()(Value* value, const Value& new_key) const {
+      *value = new_key;
+    }
+  };
+
+  // The actual data
+  typedef dense_hashtable<Value, Value, HashFcn, Identity, SetKey,
+                          EqualKey, Alloc> ht;
+  ht rep;
+
+ public:
+  typedef typename ht::key_type key_type;
+  typedef typename ht::value_type value_type;
+  typedef typename ht::hasher hasher;
+  typedef typename ht::key_equal key_equal;
+  typedef Alloc allocator_type;
+
+  typedef typename ht::size_type size_type;
+  typedef typename ht::difference_type difference_type;
+  typedef typename ht::const_pointer pointer;
+  typedef typename ht::const_pointer const_pointer;
+  typedef typename ht::const_reference reference;
+  typedef typename ht::const_reference const_reference;
+
+  typedef typename ht::const_iterator iterator;
+  typedef typename ht::const_iterator const_iterator;
+  typedef typename ht::const_local_iterator local_iterator;
+  typedef typename ht::const_local_iterator const_local_iterator;
+
+
+  // Iterator functions -- recall all iterators are const
+  iterator begin() const                  { return rep.begin(); }
+  iterator end() const                    { return rep.end(); }
+
+  // These come from tr1's unordered_set. For us, a bucket has 0 or 1 elements.
+  local_iterator begin(size_type i) const { return rep.begin(i); }
+  local_iterator end(size_type i) const   { return rep.end(i); }
+
+
+  // Accessor functions
+  allocator_type get_allocator() const    { return rep.get_allocator(); }
+  hasher hash_funct() const               { return rep.hash_funct(); }
+  hasher hash_function() const            { return hash_funct(); }  // tr1 name
+  key_equal key_eq() const                { return rep.key_eq(); }
+
+
+  // Constructors
+  explicit dense_hash_set(size_type expected_max_items_in_table = 0,
+                          const hasher& hf = hasher(),
+                          const key_equal& eql = key_equal(),
+                          const allocator_type& alloc = allocator_type())
+      : rep(expected_max_items_in_table, hf, eql, Identity(), SetKey(), alloc) {
+  }
+
+  template <class InputIterator>
+  dense_hash_set(InputIterator f, InputIterator l,
+                 const key_type& empty_key_val,
+                 size_type expected_max_items_in_table = 0,
+                 const hasher& hf = hasher(),
+                 const key_equal& eql = key_equal(),
+                 const allocator_type& alloc = allocator_type())
+      : rep(expected_max_items_in_table, hf, eql, Identity(), SetKey(), alloc) {
+    set_empty_key(empty_key_val);
+    rep.insert(f, l);
+  }
+  // We use the default copy constructor
+  // We use the default operator=()
+  // We use the default destructor
+
+  void clear()                        { rep.clear(); }
+  // This clears the hash set without resizing it down to the minimum
+  // bucket count, but rather keeps the number of buckets constant
+  void clear_no_resize()              { rep.clear_no_resize(); }
+  void swap(dense_hash_set& hs)       { rep.swap(hs.rep); }
+
+
+  // Functions concerning size
+  size_type size() const              { return rep.size(); }
+  size_type max_size() const          { return rep.max_size(); }
+  bool empty() const                  { return rep.empty(); }
+  size_type bucket_count() const      { return rep.bucket_count(); }
+  size_type max_bucket_count() const  { return rep.max_bucket_count(); }
+
+  // These are tr1 methods.  bucket() is the bucket the key is or would be in.
+  size_type bucket_size(size_type i) const    { return rep.bucket_size(i); }
+  size_type bucket(const key_type& key) const { return rep.bucket(key); }
+  float load_factor() const {
+    return size() * 1.0f / bucket_count();
+  }
+  float max_load_factor() const {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    return grow;
+  }
+  void max_load_factor(float new_grow) {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    rep.set_resizing_parameters(shrink, new_grow);
+  }
+  // These aren't tr1 methods but perhaps ought to be.
+  float min_load_factor() const {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    return shrink;
+  }
+  void min_load_factor(float new_shrink) {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    rep.set_resizing_parameters(new_shrink, grow);
+  }
+  // Deprecated; use min_load_factor() or max_load_factor() instead.
+  void set_resizing_parameters(float shrink, float grow) {
+    rep.set_resizing_parameters(shrink, grow);
+  }
+
+  void resize(size_type hint)         { rep.resize(hint); }
+  void rehash(size_type hint)         { resize(hint); }     // the tr1 name
+
+  // Lookup routines
+  iterator find(const key_type& key) const           { return rep.find(key); }
+
+  size_type count(const key_type& key) const         { return rep.count(key); }
+
+  std::pair<iterator, iterator> equal_range(const key_type& key) const {
+    return rep.equal_range(key);
+  }
+
+
+  // Insertion routines
+  std::pair<iterator, bool> insert(const value_type& obj) {
+    std::pair<typename ht::iterator, bool> p = rep.insert(obj);
+    return std::pair<iterator, bool>(p.first, p.second);   // const to non-const
+  }
+  template <class InputIterator> void insert(InputIterator f, InputIterator l) {
+    rep.insert(f, l);
+  }
+  void insert(const_iterator f, const_iterator l) {
+    rep.insert(f, l);
+  }
+  // Required for std::insert_iterator; the passed-in iterator is ignored.
+  iterator insert(iterator, const value_type& obj)   {
+    return insert(obj).first;
+  }
+
+  // Deletion and empty routines
+  // THESE ARE NON-STANDARD!  I make you specify an "impossible" key
+  // value to identify deleted and empty buckets.  You can change the
+  // deleted key as time goes on, or get rid of it entirely to be insert-only.
+  void set_empty_key(const key_type& key)     { rep.set_empty_key(key); }
+  key_type empty_key() const                  { return rep.empty_key(); }
+
+  void set_deleted_key(const key_type& key)   { rep.set_deleted_key(key); }
+  void clear_deleted_key()                    { rep.clear_deleted_key(); }
+  key_type deleted_key() const                { return rep.deleted_key(); }
+
+  // These are standard
+  size_type erase(const key_type& key)               { return rep.erase(key); }
+  void erase(iterator it)                            { rep.erase(it); }
+  void erase(iterator f, iterator l)                 { rep.erase(f, l); }
+
+
+  // Comparison
+  bool operator==(const dense_hash_set& hs) const    { return rep == hs.rep; }
+  bool operator!=(const dense_hash_set& hs) const    { return rep != hs.rep; }
+
+
+  // I/O -- this is an add-on for writing metainformation to disk
+  //
+  // For maximum flexibility, this does not assume a particular
+  // file type (though it will probably be a FILE *).  We just pass
+  // the fp through to rep.
+
+  // If your keys and values are simple enough, you can pass this
+  // serializer to serialize()/unserialize().  "Simple enough" means
+  // value_type is a POD type that contains no pointers.  Note,
+  // however, we don't try to normalize endianness.
+  typedef typename ht::NopointerSerializer NopointerSerializer;
+
+  // serializer: a class providing operator()(OUTPUT*, const value_type&)
+  //    (writing value_type to OUTPUT).  You can specify a
+  //    NopointerSerializer object if appropriate (see above).
+  // fp: either a FILE*, OR an ostream*/subclass_of_ostream*, OR a
+  //    pointer to a class providing size_t Write(const void*, size_t),
+  //    which writes a buffer into a stream (which fp presumably
+  //    owns) and returns the number of bytes successfully written.
+  //    Note basic_ostream<not_char> is not currently supported.
+  template <typename ValueSerializer, typename OUTPUT>
+  bool serialize(ValueSerializer serializer, OUTPUT* fp) {
+    return rep.serialize(serializer, fp);
+  }
+
+  // serializer: a functor providing operator()(INPUT*, value_type*)
+  //    (reading from INPUT and into value_type).  You can specify a
+  //    NopointerSerializer object if appropriate (see above).
+  // fp: either a FILE*, OR an istream*/subclass_of_istream*, OR a
+  //    pointer to a class providing size_t Read(void*, size_t),
+  //    which reads into a buffer from a stream (which fp presumably
+  //    owns) and returns the number of bytes successfully read.
+  //    Note basic_istream<not_char> is not currently supported.
+  template <typename ValueSerializer, typename INPUT>
+  bool unserialize(ValueSerializer serializer, INPUT* fp) {
+    return rep.unserialize(serializer, fp);
+  }
+};
+
+template <class Val, class HashFcn, class EqualKey, class Alloc>
+inline void swap(dense_hash_set<Val, HashFcn, EqualKey, Alloc>& hs1,
+                 dense_hash_set<Val, HashFcn, EqualKey, Alloc>& hs2) {
+  hs1.swap(hs2);
+}
+
+_END_GOOGLE_NAMESPACE_
+
+#endif /* _DENSE_HASH_SET_H_ */

src/includes/3thparty/sparsehash/internal/hashtable-common.h

@@ -0,0 +1,381 @@
+// Copyright (c) 2010, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ---
+//
+// Provides classes shared by both sparse and dense hashtable.
+//
+// sh_hashtable_settings has parameters for growing and shrinking
+// a hashtable.  It also packages zero-size functor (ie. hasher).
+//
+// Other functions and classes provide common code for serializing
+// and deserializing hashtables to a stream (such as a FILE*).
+
+#ifndef UTIL_GTL_HASHTABLE_COMMON_H_
+#define UTIL_GTL_HASHTABLE_COMMON_H_
+
+#include "./sparseconfig.h"
+#include <assert.h>
+#include <stdio.h>
+#include <stddef.h>                  // for size_t
+#include <iosfwd>
+#include <stdexcept>                 // For length_error
+
+_START_GOOGLE_NAMESPACE_
+
+template <bool> struct SparsehashCompileAssert { };
+#define SPARSEHASH_COMPILE_ASSERT(expr, msg) \
+  __attribute__((unused)) typedef SparsehashCompileAssert<(bool(expr))> msg[bool(expr) ? 1 : -1]
+
+namespace sparsehash_internal {
+
+// Adaptor methods for reading/writing data from an INPUT or OUPTUT
+// variable passed to serialize() or unserialize().  For now we
+// have implemented INPUT/OUTPUT for FILE*, istream*/ostream* (note
+// they are pointers, unlike typical use), or else a pointer to
+// something that supports a Read()/Write() method.
+//
+// For technical reasons, we implement read_data/write_data in two
+// stages.  The actual work is done in *_data_internal, which takes
+// the stream argument twice: once as a template type, and once with
+// normal type information.  (We only use the second version.)  We do
+// this because of how C++ picks what function overload to use.  If we
+// implemented this the naive way:
+//    bool read_data(istream* is, const void* data, size_t length);
+//    template<typename T> read_data(T* fp,  const void* data, size_t length);
+// C++ would prefer the second version for every stream type except
+// istream.  However, we want C++ to prefer the first version for
+// streams that are *subclasses* of istream, such as istringstream.
+// This is not possible given the way template types are resolved.  So
+// we split the stream argument in two, one of which is templated and
+// one of which is not.  The specialized functions (like the istream
+// version above) ignore the template arg and use the second, 'type'
+// arg, getting subclass matching as normal.  The 'catch-all'
+// functions (the second version above) use the template arg to deduce
+// the type, and use a second, void* arg to achieve the desired
+// 'catch-all' semantics.
+
+// ----- low-level I/O for FILE* ----
+
+template<typename Ignored>
+inline bool read_data_internal(Ignored*, FILE* fp,
+                               void* data, size_t length) {
+  return fread(data, length, 1, fp) == 1;
+}
+
+template<typename Ignored>
+inline bool write_data_internal(Ignored*, FILE* fp,
+                                const void* data, size_t length) {
+  return fwrite(data, length, 1, fp) == 1;
+}
+
+// ----- low-level I/O for iostream ----
+
+// We want the caller to be responsible for #including <iostream>, not
+// us, because iostream is a big header!  According to the standard,
+// it's only legal to delay the instantiation the way we want to if
+// the istream/ostream is a template type.  So we jump through hoops.
+template<typename ISTREAM>
+inline bool read_data_internal_for_istream(ISTREAM* fp,
+                                           void* data, size_t length) {
+  return fp->read(reinterpret_cast<char*>(data), length).good();
+}
+template<typename Ignored>
+inline bool read_data_internal(Ignored*, std::istream* fp,
+                               void* data, size_t length) {
+  return read_data_internal_for_istream(fp, data, length);
+}
+
+template<typename OSTREAM>
+inline bool write_data_internal_for_ostream(OSTREAM* fp,
+                                            const void* data, size_t length) {
+  return fp->write(reinterpret_cast<const char*>(data), length).good();
+}
+template<typename Ignored>
+inline bool write_data_internal(Ignored*, std::ostream* fp,
+                                const void* data, size_t length) {
+  return write_data_internal_for_ostream(fp, data, length);
+}
+
+// ----- low-level I/O for custom streams ----
+
+// The INPUT type needs to support a Read() method that takes a
+// buffer and a length and returns the number of bytes read.
+template <typename INPUT>
+inline bool read_data_internal(INPUT* fp, void*,
+                               void* data, size_t length) {
+  return static_cast<size_t>(fp->Read(data, length)) == length;
+}
+
+// The OUTPUT type needs to support a Write() operation that takes
+// a buffer and a length and returns the number of bytes written.
+template <typename OUTPUT>
+inline bool write_data_internal(OUTPUT* fp, void*,
+                                const void* data, size_t length) {
+  return static_cast<size_t>(fp->Write(data, length)) == length;
+}
+
+// ----- low-level I/O: the public API ----
+
+template <typename INPUT>
+inline bool read_data(INPUT* fp, void* data, size_t length) {
+  return read_data_internal(fp, fp, data, length);
+}
+
+template <typename OUTPUT>
+inline bool write_data(OUTPUT* fp, const void* data, size_t length) {
+  return write_data_internal(fp, fp, data, length);
+}
+
+// Uses read_data() and write_data() to read/write an integer.
+// length is the number of bytes to read/write (which may differ
+// from sizeof(IntType), allowing us to save on a 32-bit system
+// and load on a 64-bit system).  Excess bytes are taken to be 0.
+// INPUT and OUTPUT must match legal inputs to read/write_data (above).
+template <typename INPUT, typename IntType>
+bool read_bigendian_number(INPUT* fp, IntType* value, size_t length) {
+  *value = 0;
+  unsigned char byte;
+  // We require IntType to be unsigned or else the shifting gets all screwy.
+  SPARSEHASH_COMPILE_ASSERT(static_cast<IntType>(-1) > static_cast<IntType>(0),
+                            serializing_int_requires_an_unsigned_type);
+  for (size_t i = 0; i < length; ++i) {
+    if (!read_data(fp, &byte, sizeof(byte))) return false;
+    *value |= static_cast<IntType>(byte) << ((length - 1 - i) * 8);
+  }
+  return true;
+}
+
+template <typename OUTPUT, typename IntType>
+bool write_bigendian_number(OUTPUT* fp, IntType value, size_t length) {
+  unsigned char byte;
+  // We require IntType to be unsigned or else the shifting gets all screwy.
+  SPARSEHASH_COMPILE_ASSERT(static_cast<IntType>(-1) > static_cast<IntType>(0),
+                            serializing_int_requires_an_unsigned_type);
+  for (size_t i = 0; i < length; ++i) {
+    byte = (sizeof(value) <= length-1 - i)
+        ? 0 : static_cast<unsigned char>((value >> ((length-1 - i) * 8)) & 255);
+    if (!write_data(fp, &byte, sizeof(byte))) return false;
+  }
+  return true;
+}
+
+// If your keys and values are simple enough, you can pass this
+// serializer to serialize()/unserialize().  "Simple enough" means
+// value_type is a POD type that contains no pointers.  Note,
+// however, we don't try to normalize endianness.
+// This is the type used for NopointerSerializer.
+template <typename value_type> struct pod_serializer {
+  template <typename INPUT>
+  bool operator()(INPUT* fp, value_type* value) const {
+    return read_data(fp, value, sizeof(*value));
+  }
+
+  template <typename OUTPUT>
+  bool operator()(OUTPUT* fp, const value_type& value) const {
+    return write_data(fp, &value, sizeof(value));
+  }
+};
+
+
+// Settings contains parameters for growing and shrinking the table.
+// It also packages zero-size functor (ie. hasher).
+//
+// It does some munging of the hash value in cases where we think
+// (fear) the original hash function might not be very good.  In
+// particular, the default hash of pointers is the identity hash,
+// so probably all the low bits are 0.  We identify when we think
+// we're hashing a pointer, and chop off the low bits.  Note this
+// isn't perfect: even when the key is a pointer, we can't tell
+// for sure that the hash is the identity hash.  If it's not, this
+// is needless work (and possibly, though not likely, harmful).
+
+template<typename Key, typename HashFunc,
+         typename SizeType, int HT_MIN_BUCKETS>
+class sh_hashtable_settings : public HashFunc {
+ public:
+  typedef Key key_type;
+  typedef HashFunc hasher;
+  typedef SizeType size_type;
+
+ public:
+  sh_hashtable_settings(const hasher& hf,
+                        const float ht_occupancy_flt,
+                        const float ht_empty_flt)
+      : hasher(hf),
+        enlarge_threshold_(0),
+        shrink_threshold_(0),
+        consider_shrink_(false),
+        use_empty_(false),
+        use_deleted_(false),
+        num_ht_copies_(0) {
+    set_enlarge_factor(ht_occupancy_flt);
+    set_shrink_factor(ht_empty_flt);
+  }
+
+  size_type hash(const key_type& v) const {
+    // We munge the hash value when we don't trust hasher::operator().
+    return hash_munger<Key>::MungedHash(hasher::operator()(v));
+  }
+
+  float enlarge_factor() const {
+    return enlarge_factor_;
+  }
+  void set_enlarge_factor(float f) {
+    enlarge_factor_ = f;
+  }
+  float shrink_factor() const {
+    return shrink_factor_;
+  }
+  void set_shrink_factor(float f) {
+    shrink_factor_ = f;
+  }
+
+  size_type enlarge_threshold() const {
+    return enlarge_threshold_;
+  }
+  void set_enlarge_threshold(size_type t) {
+    enlarge_threshold_ = t;
+  }
+  size_type shrink_threshold() const {
+    return shrink_threshold_;
+  }
+  void set_shrink_threshold(size_type t) {
+    shrink_threshold_ = t;
+  }
+
+  size_type enlarge_size(size_type x) const {
+    return static_cast<size_type>(x * enlarge_factor_);
+  }
+  size_type shrink_size(size_type x) const {
+    return static_cast<size_type>(x * shrink_factor_);
+  }
+
+  bool consider_shrink() const {
+    return consider_shrink_;
+  }
+  void set_consider_shrink(bool t) {
+    consider_shrink_ = t;
+  }
+
+  bool use_empty() const {
+    return use_empty_;
+  }
+  void set_use_empty(bool t) {
+    use_empty_ = t;
+  }
+
+  bool use_deleted() const {
+    return use_deleted_;
+  }
+  void set_use_deleted(bool t) {
+    use_deleted_ = t;
+  }
+
+  size_type num_ht_copies() const {
+    return static_cast<size_type>(num_ht_copies_);
+  }
+  void inc_num_ht_copies() {
+    ++num_ht_copies_;
+  }
+
+  // Reset the enlarge and shrink thresholds
+  void reset_thresholds(size_type num_buckets) {
+    set_enlarge_threshold(enlarge_size(num_buckets));
+    set_shrink_threshold(shrink_size(num_buckets));
+    // whatever caused us to reset already considered
+    set_consider_shrink(false);
+  }
+
+  // Caller is resposible for calling reset_threshold right after
+  // set_resizing_parameters.
+  void set_resizing_parameters(float shrink, float grow) {
+    assert(shrink >= 0.0);
+    assert(grow <= 1.0);
+    if (shrink > grow/2.0f)
+      shrink = grow / 2.0f;     // otherwise we thrash hashtable size
+    set_shrink_factor(shrink);
+    set_enlarge_factor(grow);
+  }
+
+  // This is the smallest size a hashtable can be without being too crowded
+  // If you like, you can give a min #buckets as well as a min #elts
+  size_type min_buckets(size_type num_elts, size_type min_buckets_wanted) {
+    float enlarge = enlarge_factor();
+    size_type sz = HT_MIN_BUCKETS;             // min buckets allowed
+    while ( sz < min_buckets_wanted ||
+            num_elts >= static_cast<size_type>(sz * enlarge) ) {
+      // This just prevents overflowing size_type, since sz can exceed
+      // max_size() here.
+      if (static_cast<size_type>(sz * 2) < sz) {
+        throw std::length_error("resize overflow");  // protect against overflow
+      }
+      sz *= 2;
+    }
+    return sz;
+  }
+
+ private:
+  template<class HashKey> class hash_munger {
+   public:
+    static size_t MungedHash(size_t hash) {
+      return hash;
+    }
+  };
+  // This matches when the hashtable key is a pointer.
+  template<class HashKey> class hash_munger<HashKey*> {
+   public:
+    static size_t MungedHash(size_t hash) {
+      // TODO(csilvers): consider rotating instead:
+      //    static const int shift = (sizeof(void *) == 4) ? 2 : 3;
+      //    return (hash << (sizeof(hash) * 8) - shift)) | (hash >> shift);
+      // This matters if we ever change sparse/dense_hash_* to compare
+      // hashes before comparing actual values.  It's speedy on x86.
+      return hash / sizeof(void*);   // get rid of known-0 bits
+    }
+  };
+
+  size_type enlarge_threshold_;  // table.size() * enlarge_factor
+  size_type shrink_threshold_;   // table.size() * shrink_factor
+  float enlarge_factor_;         // how full before resize
+  float shrink_factor_;          // how empty before resize
+  // consider_shrink=true if we should try to shrink before next insert
+  bool consider_shrink_;
+  bool use_empty_;    // used only by densehashtable, not sparsehashtable
+  bool use_deleted_;  // false until delkey has been set
+  // num_ht_copies is a counter incremented every Copy/Move
+  unsigned int num_ht_copies_;
+};
+
+}  // namespace sparsehash_internal
+
+#undef SPARSEHASH_COMPILE_ASSERT
+_END_GOOGLE_NAMESPACE_
+
+#endif  // UTIL_GTL_HASHTABLE_COMMON_H_

src/includes/3thparty/sparsehash/internal/libc_allocator_with_realloc.h

@@ -0,0 +1,122 @@
+// Copyright (c) 2010, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ---
+
+#ifndef UTIL_GTL_LIBC_ALLOCATOR_WITH_REALLOC_H_
+#define UTIL_GTL_LIBC_ALLOCATOR_WITH_REALLOC_H_
+
+#include "./sparseconfig.h"
+#include <stdlib.h>           // for malloc/realloc/free
+#include <stddef.h>           // for ptrdiff_t
+#include <new>                // for placement new
+
+_START_GOOGLE_NAMESPACE_
+
+template<class T>
+class libc_allocator_with_realloc {
+ public:
+  typedef T value_type;
+  typedef size_t size_type;
+  typedef ptrdiff_t difference_type;
+
+  typedef T* pointer;
+  typedef const T* const_pointer;
+  typedef T& reference;
+  typedef const T& const_reference;
+
+  libc_allocator_with_realloc() {}
+  libc_allocator_with_realloc(const libc_allocator_with_realloc&) {}
+  ~libc_allocator_with_realloc() {}
+
+  pointer address(reference r) const  { return &r; }
+  const_pointer address(const_reference r) const  { return &r; }
+
+  pointer allocate(size_type n, const_pointer = 0) {
+    return static_cast<pointer>(malloc(n * sizeof(value_type)));
+  }
+  void deallocate(pointer p, size_type) {
+    free(p);
+  }
+  pointer reallocate(pointer p, size_type n) {
+    // p points to a storage array whose objects have already been destroyed
+    // cast to void* to prevent compiler warnings about calling realloc() on
+    // an object which cannot be relocated in memory
+    return static_cast<pointer>(realloc(static_cast<void*>(p), n * sizeof(value_type)));
+  }
+
+  size_type max_size() const  {
+    return static_cast<size_type>(-1) / sizeof(value_type);
+  }
+
+  void construct(pointer p, const value_type& val) {
+    new(p) value_type(val);
+  }
+  void destroy(pointer p) { p->~value_type(); }
+
+  template <class U>
+  libc_allocator_with_realloc(const libc_allocator_with_realloc<U>&) {}
+
+  template<class U>
+  struct rebind {
+    typedef libc_allocator_with_realloc<U> other;
+  };
+};
+
+// libc_allocator_with_realloc<void> specialization.
+template<>
+class libc_allocator_with_realloc<void> {
+ public:
+  typedef void value_type;
+  typedef size_t size_type;
+  typedef ptrdiff_t difference_type;
+  typedef void* pointer;
+  typedef const void* const_pointer;
+
+  template<class U>
+  struct rebind {
+    typedef libc_allocator_with_realloc<U> other;
+  };
+};
+
+template<class T>
+inline bool operator==(const libc_allocator_with_realloc<T>&,
+                       const libc_allocator_with_realloc<T>&) {
+  return true;
+}
+
+template<class T>
+inline bool operator!=(const libc_allocator_with_realloc<T>&,
+                       const libc_allocator_with_realloc<T>&) {
+  return false;
+}
+
+_END_GOOGLE_NAMESPACE_
+
+#endif  // UTIL_GTL_LIBC_ALLOCATOR_WITH_REALLOC_H_

src/includes/3thparty/sparsehash/internal/sparseconfig.h

@@ -0,0 +1,46 @@
+/*
+ * NOTE: This file is for internal use only.
+ *       Do not use these #defines in your own program!
+ */
+
+/* Namespace for Google classes */
+#define GOOGLE_NAMESPACE ::google
+
+/* the location of the header defining hash functions */
+#define HASH_FUN_H <functional>
+
+/* the namespace of the hash<> function */
+#define HASH_NAMESPACE std
+
+/* Define to 1 if you have the <inttypes.h> header file. */
+#define HAVE_INTTYPES_H 1
+
+/* Define to 1 if the system has the type `long long'. */
+#define HAVE_LONG_LONG 1
+
+/* Define to 1 if you have the `memcpy' function. */
+#define HAVE_MEMCPY 1
+
+/* Define to 1 if you have the <stdint.h> header file. */
+#define HAVE_STDINT_H 1
+
+/* Define to 1 if you have the <sys/types.h> header file. */
+#define HAVE_SYS_TYPES_H 1
+
+/* Define to 1 if the system has the type `uint16_t'. */
+#define HAVE_UINT16_T 1
+
+/* Define to 1 if the system has the type `u_int16_t'. */
+#define HAVE_U_INT16_T 1
+
+/* Define to 1 if the system has the type `__uint16'. */
+/* #undef HAVE___UINT16 */
+
+/* The system-provided hash function including the namespace. */
+#define SPARSEHASH_HASH HASH_NAMESPACE::hash
+
+/* Stops putting the code inside the Google namespace */
+#define _END_GOOGLE_NAMESPACE_ }
+
+/* Puts following code inside the Google namespace */
+#define _START_GOOGLE_NAMESPACE_ namespace google {

src/includes/3thparty/sparsehash/sparse_hash_map

@@ -0,0 +1,363 @@
+// Copyright (c) 2005, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ---
+//
+// This is just a very thin wrapper over sparsehashtable.h, just
+// like sgi stl's stl_hash_map is a very thin wrapper over
+// stl_hashtable.  The major thing we define is operator[], because
+// we have a concept of a data_type which stl_hashtable doesn't
+// (it only has a key and a value).
+//
+// We adhere mostly to the STL semantics for hash-map.  One important
+// exception is that insert() may invalidate iterators entirely -- STL
+// semantics are that insert() may reorder iterators, but they all
+// still refer to something valid in the hashtable.  Not so for us.
+// Likewise, insert() may invalidate pointers into the hashtable.
+// (Whether insert invalidates iterators and pointers depends on
+// whether it results in a hashtable resize).  On the plus side,
+// delete() doesn't invalidate iterators or pointers at all, or even
+// change the ordering of elements.
+//
+// Here are a few "power user" tips:
+//
+//    1) set_deleted_key():
+//         Unlike STL's hash_map, if you want to use erase() you
+//         *must* call set_deleted_key() after construction.
+//
+//    2) resize(0):
+//         When an item is deleted, its memory isn't freed right
+//         away.  This is what allows you to iterate over a hashtable
+//         and call erase() without invalidating the iterator.
+//         To force the memory to be freed, call resize(0).
+//         For tr1 compatibility, this can also be called as rehash(0).
+//
+//    3) min_load_factor(0.0)
+//         Setting the minimum load factor to 0.0 guarantees that
+//         the hash table will never shrink.
+//
+// Roughly speaking:
+//   (1) dense_hash_map: fastest, uses the most memory unless entries are small
+//   (2) sparse_hash_map: slowest, uses the least memory
+//   (3) hash_map / unordered_map (STL): in the middle
+//
+// Typically I use sparse_hash_map when I care about space and/or when
+// I need to save the hashtable on disk.  I use hash_map otherwise.  I
+// don't personally use dense_hash_map ever; some people use it for
+// small maps with lots of lookups.
+//
+// - dense_hash_map has, typically, about 78% memory overhead (if your
+//   data takes up X bytes, the hash_map uses .78X more bytes in overhead).
+// - sparse_hash_map has about 4 bits overhead per entry.
+// - sparse_hash_map can be 3-7 times slower than the others for lookup and,
+//   especially, inserts.  See time_hash_map.cc for details.
+//
+// See /usr/(local/)?doc/sparsehash-*/sparse_hash_map.html
+// for information about how to use this class.
+
+#ifndef _SPARSE_HASH_MAP_H_
+#define _SPARSE_HASH_MAP_H_
+
+#include "./internal/sparseconfig.h"
+#include <algorithm>                        // needed by stl_alloc
+#include <functional>                       // for equal_to<>, select1st<>, etc
+#include <memory>                           // for alloc
+#include <utility>                          // for pair<>
+#include "./internal/libc_allocator_with_realloc.h"
+#include "./internal/sparsehashtable.h"       // IWYU pragma: export
+#include HASH_FUN_H                 // for hash<>
+_START_GOOGLE_NAMESPACE_
+
+template <class Key, class T,
+          class HashFcn = SPARSEHASH_HASH<Key>,   // defined in sparseconfig.h
+          class EqualKey = std::equal_to<Key>,
+          class Alloc = libc_allocator_with_realloc<std::pair<const Key, T> > >
+class sparse_hash_map {
+ private:
+  // Apparently select1st is not stl-standard, so we define our own
+  struct SelectKey {
+    typedef const Key& result_type;
+    const Key& operator()(const std::pair<const Key, T>& p) const {
+      return p.first;
+    }
+  };
+  struct SetKey {
+    void operator()(std::pair<const Key, T>* value, const Key& new_key) const {
+      *const_cast<Key*>(&value->first) = new_key;
+      // It would be nice to clear the rest of value here as well, in
+      // case it's taking up a lot of memory.  We do this by clearing
+      // the value.  This assumes T has a zero-arg constructor!
+      value->second = T();
+    }
+  };
+  // For operator[].
+  struct DefaultValue {
+    std::pair<const Key, T> operator()(const Key& key) {
+      return std::make_pair(key, T());
+    }
+  };
+
+  // The actual data
+  typedef sparse_hashtable<std::pair<const Key, T>, Key, HashFcn, SelectKey,
+                           SetKey, EqualKey, Alloc> ht;
+  ht rep;
+
+ public:
+  typedef typename ht::key_type key_type;
+  typedef T data_type;
+  typedef T mapped_type;
+  typedef typename ht::value_type value_type;
+  typedef typename ht::hasher hasher;
+  typedef typename ht::key_equal key_equal;
+  typedef Alloc allocator_type;
+
+  typedef typename ht::size_type size_type;
+  typedef typename ht::difference_type difference_type;
+  typedef typename ht::pointer pointer;
+  typedef typename ht::const_pointer const_pointer;
+  typedef typename ht::reference reference;
+  typedef typename ht::const_reference const_reference;
+
+  typedef typename ht::iterator iterator;
+  typedef typename ht::const_iterator const_iterator;
+  typedef typename ht::local_iterator local_iterator;
+  typedef typename ht::const_local_iterator const_local_iterator;
+
+  // Iterator functions
+  iterator begin()                               { return rep.begin(); }
+  iterator end()                                 { return rep.end(); }
+  const_iterator begin() const                   { return rep.begin(); }
+  const_iterator end() const                     { return rep.end(); }
+
+  // These come from tr1's unordered_map. For us, a bucket has 0 or 1 elements.
+  local_iterator begin(size_type i)              { return rep.begin(i); }
+  local_iterator end(size_type i)                { return rep.end(i); }
+  const_local_iterator begin(size_type i) const  { return rep.begin(i); }
+  const_local_iterator end(size_type i) const    { return rep.end(i); }
+
+  // Accessor functions
+  allocator_type get_allocator() const           { return rep.get_allocator(); }
+  hasher hash_funct() const                      { return rep.hash_funct(); }
+  hasher hash_function() const                   { return hash_funct(); }
+  key_equal key_eq() const                       { return rep.key_eq(); }
+
+
+  // Constructors
+  explicit sparse_hash_map(size_type expected_max_items_in_table = 0,
+                           const hasher& hf = hasher(),
+                           const key_equal& eql = key_equal(),
+                           const allocator_type& alloc = allocator_type())
+    : rep(expected_max_items_in_table, hf, eql, SelectKey(), SetKey(), alloc) {
+  }
+
+  template <class InputIterator>
+  sparse_hash_map(InputIterator f, InputIterator l,
+                  size_type expected_max_items_in_table = 0,
+                  const hasher& hf = hasher(),
+                  const key_equal& eql = key_equal(),
+                  const allocator_type& alloc = allocator_type())
+    : rep(expected_max_items_in_table, hf, eql, SelectKey(), SetKey(), alloc) {
+    rep.insert(f, l);
+  }
+  // We use the default copy constructor
+  // We use the default operator=()
+  // We use the default destructor
+
+  void clear()                        { rep.clear(); }
+  void swap(sparse_hash_map& hs)      { rep.swap(hs.rep); }
+
+
+  // Functions concerning size
+  size_type size() const              { return rep.size(); }
+  size_type max_size() const          { return rep.max_size(); }
+  bool empty() const                  { return rep.empty(); }
+  size_type bucket_count() const      { return rep.bucket_count(); }
+  size_type max_bucket_count() const  { return rep.max_bucket_count(); }
+
+  // These are tr1 methods.  bucket() is the bucket the key is or would be in.
+  size_type bucket_size(size_type i) const    { return rep.bucket_size(i); }
+  size_type bucket(const key_type& key) const { return rep.bucket(key); }
+  float load_factor() const {
+    return size() * 1.0f / bucket_count();
+  }
+  float max_load_factor() const {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    return grow;
+  }
+  void max_load_factor(float new_grow) {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    rep.set_resizing_parameters(shrink, new_grow);
+  }
+  // These aren't tr1 methods but perhaps ought to be.
+  float min_load_factor() const {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    return shrink;
+  }
+  void min_load_factor(float new_shrink) {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    rep.set_resizing_parameters(new_shrink, grow);
+  }
+  // Deprecated; use min_load_factor() or max_load_factor() instead.
+  void set_resizing_parameters(float shrink, float grow) {
+    rep.set_resizing_parameters(shrink, grow);
+  }
+
+  void resize(size_type hint)         { rep.resize(hint); }
+  void rehash(size_type hint)         { resize(hint); }      // the tr1 name
+
+  // Lookup routines
+  iterator find(const key_type& key)                 { return rep.find(key); }
+  const_iterator find(const key_type& key) const     { return rep.find(key); }
+
+  data_type& operator[](const key_type& key) {       // This is our value-add!
+    // If key is in the hashtable, returns find(key)->second,
+    // otherwise returns insert(value_type(key, T()).first->second.
+    // Note it does not create an empty T unless the find fails.
+    return rep.template find_or_insert<DefaultValue>(key).second;
+  }
+
+  size_type count(const key_type& key) const         { return rep.count(key); }
+
+  std::pair<iterator, iterator> equal_range(const key_type& key) {
+    return rep.equal_range(key);
+  }
+  std::pair<const_iterator, const_iterator> equal_range(const key_type& key)
+      const {
+    return rep.equal_range(key);
+  }
+
+  // Insertion routines
+  std::pair<iterator, bool> insert(const value_type& obj) {
+    return rep.insert(obj);
+  }
+  template <class InputIterator> void insert(InputIterator f, InputIterator l) {
+    rep.insert(f, l);
+  }
+  void insert(const_iterator f, const_iterator l) {
+    rep.insert(f, l);
+  }
+  // Required for std::insert_iterator; the passed-in iterator is ignored.
+  iterator insert(iterator, const value_type& obj) {
+    return insert(obj).first;
+  }
+
+  // Deletion routines
+  // THESE ARE NON-STANDARD!  I make you specify an "impossible" key
+  // value to identify deleted buckets.  You can change the key as
+  // time goes on, or get rid of it entirely to be insert-only.
+  void set_deleted_key(const key_type& key)   {
+    rep.set_deleted_key(key);
+  }
+  void clear_deleted_key()                    { rep.clear_deleted_key(); }
+  key_type deleted_key() const                { return rep.deleted_key(); }
+
+  // These are standard
+  size_type erase(const key_type& key)               { return rep.erase(key); }
+  void erase(iterator it)                            { rep.erase(it); }
+  void erase(iterator f, iterator l)                 { rep.erase(f, l); }
+
+
+  // Comparison
+  bool operator==(const sparse_hash_map& hs) const   { return rep == hs.rep; }
+  bool operator!=(const sparse_hash_map& hs) const   { return rep != hs.rep; }
+
+
+  // I/O -- this is an add-on for writing metainformation to disk
+  //
+  // For maximum flexibility, this does not assume a particular
+  // file type (though it will probably be a FILE *).  We just pass
+  // the fp through to rep.
+
+  // If your keys and values are simple enough, you can pass this
+  // serializer to serialize()/unserialize().  "Simple enough" means
+  // value_type is a POD type that contains no pointers.  Note,
+  // however, we don't try to normalize endianness.
+  typedef typename ht::NopointerSerializer NopointerSerializer;
+
+  // serializer: a class providing operator()(OUTPUT*, const value_type&)
+  //    (writing value_type to OUTPUT).  You can specify a
+  //    NopointerSerializer object if appropriate (see above).
+  // fp: either a FILE*, OR an ostream*/subclass_of_ostream*, OR a
+  //    pointer to a class providing size_t Write(const void*, size_t),
+  //    which writes a buffer into a stream (which fp presumably
+  //    owns) and returns the number of bytes successfully written.
+  //    Note basic_ostream<not_char> is not currently supported.
+  template <typename ValueSerializer, typename OUTPUT>
+  bool serialize(ValueSerializer serializer, OUTPUT* fp) {
+    return rep.serialize(serializer, fp);
+  }
+
+  // serializer: a functor providing operator()(INPUT*, value_type*)
+  //    (reading from INPUT and into value_type).  You can specify a
+  //    NopointerSerializer object if appropriate (see above).
+  // fp: either a FILE*, OR an istream*/subclass_of_istream*, OR a
+  //    pointer to a class providing size_t Read(void*, size_t),
+  //    which reads into a buffer from a stream (which fp presumably
+  //    owns) and returns the number of bytes successfully read.
+  //    Note basic_istream<not_char> is not currently supported.
+  // NOTE: Since value_type is std::pair<const Key, T>, ValueSerializer
+  // may need to do a const cast in order to fill in the key.
+  // NOTE: if Key or T are not POD types, the serializer MUST use
+  // placement-new to initialize their values, rather than a normal
+  // equals-assignment or similar.  (The value_type* passed into the
+  // serializer points to garbage memory.)
+  template <typename ValueSerializer, typename INPUT>
+  bool unserialize(ValueSerializer serializer, INPUT* fp) {
+    return rep.unserialize(serializer, fp);
+  }
+
+  // The four methods below are DEPRECATED.
+  // Use serialize() and unserialize() for new code.
+  template <typename OUTPUT>
+  bool write_metadata(OUTPUT *fp)       { return rep.write_metadata(fp); }
+
+  template <typename INPUT>
+  bool read_metadata(INPUT *fp)         { return rep.read_metadata(fp); }
+
+  template <typename OUTPUT>
+  bool write_nopointer_data(OUTPUT *fp) { return rep.write_nopointer_data(fp); }
+
+  template <typename INPUT>
+  bool read_nopointer_data(INPUT *fp)   { return rep.read_nopointer_data(fp); }
+};
+
+// We need a global swap as well
+template <class Key, class T, class HashFcn, class EqualKey, class Alloc>
+inline void swap(sparse_hash_map<Key, T, HashFcn, EqualKey, Alloc>& hm1,
+                 sparse_hash_map<Key, T, HashFcn, EqualKey, Alloc>& hm2) {
+  hm1.swap(hm2);
+}
+
+_END_GOOGLE_NAMESPACE_
+
+#endif /* _SPARSE_HASH_MAP_H_ */

src/includes/3thparty/sparsehash/sparse_hash_set

@@ -0,0 +1,338 @@
+// Copyright (c) 2005, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ---
+//
+// This is just a very thin wrapper over sparsehashtable.h, just
+// like sgi stl's stl_hash_set is a very thin wrapper over
+// stl_hashtable.  The major thing we define is operator[], because
+// we have a concept of a data_type which stl_hashtable doesn't
+// (it only has a key and a value).
+//
+// This is more different from sparse_hash_map than you might think,
+// because all iterators for sets are const (you obviously can't
+// change the key, and for sets there is no value).
+//
+// We adhere mostly to the STL semantics for hash-map.  One important
+// exception is that insert() may invalidate iterators entirely -- STL
+// semantics are that insert() may reorder iterators, but they all
+// still refer to something valid in the hashtable.  Not so for us.
+// Likewise, insert() may invalidate pointers into the hashtable.
+// (Whether insert invalidates iterators and pointers depends on
+// whether it results in a hashtable resize).  On the plus side,
+// delete() doesn't invalidate iterators or pointers at all, or even
+// change the ordering of elements.
+//
+// Here are a few "power user" tips:
+//
+//    1) set_deleted_key():
+//         Unlike STL's hash_map, if you want to use erase() you
+//         *must* call set_deleted_key() after construction.
+//
+//    2) resize(0):
+//         When an item is deleted, its memory isn't freed right
+//         away.  This allows you to iterate over a hashtable,
+//         and call erase(), without invalidating the iterator.
+//         To force the memory to be freed, call resize(0).
+//         For tr1 compatibility, this can also be called as rehash(0).
+//
+//    3) min_load_factor(0.0)
+//         Setting the minimum load factor to 0.0 guarantees that
+//         the hash table will never shrink.
+//
+// Roughly speaking:
+//   (1) dense_hash_set: fastest, uses the most memory unless entries are small
+//   (2) sparse_hash_set: slowest, uses the least memory
+//   (3) hash_set / unordered_set (STL): in the middle
+//
+// Typically I use sparse_hash_set when I care about space and/or when
+// I need to save the hashtable on disk.  I use hash_set otherwise.  I
+// don't personally use dense_hash_set ever; some people use it for
+// small sets with lots of lookups.
+//
+// - dense_hash_set has, typically, about 78% memory overhead (if your
+//   data takes up X bytes, the hash_set uses .78X more bytes in overhead).
+// - sparse_hash_set has about 4 bits overhead per entry.
+// - sparse_hash_set can be 3-7 times slower than the others for lookup and,
+//   especially, inserts.  See time_hash_map.cc for details.
+//
+// See /usr/(local/)?doc/sparsehash-*/sparse_hash_set.html
+// for information about how to use this class.
+
+#ifndef _SPARSE_HASH_SET_H_
+#define _SPARSE_HASH_SET_H_
+
+#include <sparsehash/internal/sparseconfig.h>
+#include <algorithm>                       // needed by stl_alloc
+#include <functional>                      // for equal_to<>
+#include <memory>                          // for alloc (which we don't use)
+#include <utility>                         // for pair<>
+#include <sparsehash/internal/libc_allocator_with_realloc.h>
+#include <sparsehash/internal/sparsehashtable.h>      // IWYU pragma: export
+#include HASH_FUN_H                // for hash<>
+
+_START_GOOGLE_NAMESPACE_
+
+template <class Value,
+          class HashFcn = SPARSEHASH_HASH<Value>,   // defined in sparseconfig.h
+          class EqualKey = std::equal_to<Value>,
+          class Alloc = libc_allocator_with_realloc<Value> >
+class sparse_hash_set {
+ private:
+  // Apparently identity is not stl-standard, so we define our own
+  struct Identity {
+    typedef const Value& result_type;
+    const Value& operator()(const Value& v) const { return v; }
+  };
+  struct SetKey {
+    void operator()(Value* value, const Value& new_key) const {
+      *value = new_key;
+    }
+  };
+
+  typedef sparse_hashtable<Value, Value, HashFcn, Identity, SetKey,
+                           EqualKey, Alloc> ht;
+  ht rep;
+
+ public:
+  typedef typename ht::key_type key_type;
+  typedef typename ht::value_type value_type;
+  typedef typename ht::hasher hasher;
+  typedef typename ht::key_equal key_equal;
+  typedef Alloc allocator_type;
+
+  typedef typename ht::size_type size_type;
+  typedef typename ht::difference_type difference_type;
+  typedef typename ht::const_pointer pointer;
+  typedef typename ht::const_pointer const_pointer;
+  typedef typename ht::const_reference reference;
+  typedef typename ht::const_reference const_reference;
+
+  typedef typename ht::const_iterator iterator;
+  typedef typename ht::const_iterator const_iterator;
+  typedef typename ht::const_local_iterator local_iterator;
+  typedef typename ht::const_local_iterator const_local_iterator;
+
+
+  // Iterator functions -- recall all iterators are const
+  iterator begin() const                  { return rep.begin(); }
+  iterator end() const                    { return rep.end(); }
+
+  // These come from tr1's unordered_set. For us, a bucket has 0 or 1 elements.
+  local_iterator begin(size_type i) const { return rep.begin(i); }
+  local_iterator end(size_type i) const   { return rep.end(i); }
+
+
+  // Accessor functions
+  allocator_type get_allocator() const    { return rep.get_allocator(); }
+  hasher hash_funct() const               { return rep.hash_funct(); }
+  hasher hash_function() const            { return hash_funct(); }  // tr1 name
+  key_equal key_eq() const                { return rep.key_eq(); }
+
+
+  // Constructors
+  explicit sparse_hash_set(size_type expected_max_items_in_table = 0,
+                           const hasher& hf = hasher(),
+                           const key_equal& eql = key_equal(),
+                           const allocator_type& alloc = allocator_type())
+      : rep(expected_max_items_in_table, hf, eql, Identity(), SetKey(), alloc) {
+  }
+
+  template <class InputIterator>
+  sparse_hash_set(InputIterator f, InputIterator l,
+                  size_type expected_max_items_in_table = 0,
+                  const hasher& hf = hasher(),
+                  const key_equal& eql = key_equal(),
+                  const allocator_type& alloc = allocator_type())
+      : rep(expected_max_items_in_table, hf, eql, Identity(), SetKey(), alloc) {
+    rep.insert(f, l);
+  }
+  // We use the default copy constructor
+  // We use the default operator=()
+  // We use the default destructor
+
+  void clear()                        { rep.clear(); }
+  void swap(sparse_hash_set& hs)      { rep.swap(hs.rep); }
+
+
+  // Functions concerning size
+  size_type size() const              { return rep.size(); }
+  size_type max_size() const          { return rep.max_size(); }
+  bool empty() const                  { return rep.empty(); }
+  size_type bucket_count() const      { return rep.bucket_count(); }
+  size_type max_bucket_count() const  { return rep.max_bucket_count(); }
+
+  // These are tr1 methods.  bucket() is the bucket the key is or would be in.
+  size_type bucket_size(size_type i) const    { return rep.bucket_size(i); }
+  size_type bucket(const key_type& key) const { return rep.bucket(key); }
+  float load_factor() const {
+    return size() * 1.0f / bucket_count();
+  }
+  float max_load_factor() const {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    return grow;
+  }
+  void max_load_factor(float new_grow) {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    rep.set_resizing_parameters(shrink, new_grow);
+  }
+  // These aren't tr1 methods but perhaps ought to be.
+  float min_load_factor() const {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    return shrink;
+  }
+  void min_load_factor(float new_shrink) {
+    float shrink, grow;
+    rep.get_resizing_parameters(&shrink, &grow);
+    rep.set_resizing_parameters(new_shrink, grow);
+  }
+  // Deprecated; use min_load_factor() or max_load_factor() instead.
+  void set_resizing_parameters(float shrink, float grow) {
+    rep.set_resizing_parameters(shrink, grow);
+  }
+
+  void resize(size_type hint)         { rep.resize(hint); }
+  void rehash(size_type hint)         { resize(hint); }     // the tr1 name
+
+  // Lookup routines
+  iterator find(const key_type& key) const           { return rep.find(key); }
+
+  size_type count(const key_type& key) const         { return rep.count(key); }
+
+  std::pair<iterator, iterator> equal_range(const key_type& key) const {
+    return rep.equal_range(key);
+  }
+
+
+  // Insertion routines
+  std::pair<iterator, bool> insert(const value_type& obj) {
+    std::pair<typename ht::iterator, bool> p = rep.insert(obj);
+    return std::pair<iterator, bool>(p.first, p.second);   // const to non-const
+  }
+  template <class InputIterator> void insert(InputIterator f, InputIterator l) {
+    rep.insert(f, l);
+  }
+  void insert(const_iterator f, const_iterator l) {
+    rep.insert(f, l);
+  }
+  // Required for std::insert_iterator; the passed-in iterator is ignored.
+  iterator insert(iterator, const value_type& obj)   {
+    return insert(obj).first;
+  }
+
+  // Deletion routines
+  // THESE ARE NON-STANDARD!  I make you specify an "impossible" key
+  // value to identify deleted buckets.  You can change the key as
+  // time goes on, or get rid of it entirely to be insert-only.
+  void set_deleted_key(const key_type& key)   { rep.set_deleted_key(key); }
+  void clear_deleted_key()                    { rep.clear_deleted_key(); }
+  key_type deleted_key() const                { return rep.deleted_key(); }
+
+  // These are standard
+  size_type erase(const key_type& key)               { return rep.erase(key); }
+  void erase(iterator it)                            { rep.erase(it); }
+  void erase(iterator f, iterator l)                 { rep.erase(f, l); }
+
+
+  // Comparison
+  bool operator==(const sparse_hash_set& hs) const   { return rep == hs.rep; }
+  bool operator!=(const sparse_hash_set& hs) const   { return rep != hs.rep; }
+
+
+  // I/O -- this is an add-on for writing metainformation to disk
+  //
+  // For maximum flexibility, this does not assume a particular
+  // file type (though it will probably be a FILE *).  We just pass
+  // the fp through to rep.
+
+  // If your keys and values are simple enough, you can pass this
+  // serializer to serialize()/unserialize().  "Simple enough" means
+  // value_type is a POD type that contains no pointers.  Note,
+  // however, we don't try to normalize endianness.
+  typedef typename ht::NopointerSerializer NopointerSerializer;
+
+  // serializer: a class providing operator()(OUTPUT*, const value_type&)
+  //    (writing value_type to OUTPUT).  You can specify a
+  //    NopointerSerializer object if appropriate (see above).
+  // fp: either a FILE*, OR an ostream*/subclass_of_ostream*, OR a
+  //    pointer to a class providing size_t Write(const void*, size_t),
+  //    which writes a buffer into a stream (which fp presumably
+  //    owns) and returns the number of bytes successfully written.
+  //    Note basic_ostream<not_char> is not currently supported.
+  template <typename ValueSerializer, typename OUTPUT>
+  bool serialize(ValueSerializer serializer, OUTPUT* fp) {
+    return rep.serialize(serializer, fp);
+  }
+
+  // serializer: a functor providing operator()(INPUT*, value_type*)
+  //    (reading from INPUT and into value_type).  You can specify a
+  //    NopointerSerializer object if appropriate (see above).
+  // fp: either a FILE*, OR an istream*/subclass_of_istream*, OR a
+  //    pointer to a class providing size_t Read(void*, size_t),
+  //    which reads into a buffer from a stream (which fp presumably
+  //    owns) and returns the number of bytes successfully read.
+  //    Note basic_istream<not_char> is not currently supported.
+  // NOTE: Since value_type is const Key, ValueSerializer
+  // may need to do a const cast in order to fill in the key.
+  // NOTE: if Key is not a POD type, the serializer MUST use
+  // placement-new to initialize its value, rather than a normal
+  // equals-assignment or similar.  (The value_type* passed into
+  // the serializer points to garbage memory.)
+  template <typename ValueSerializer, typename INPUT>
+  bool unserialize(ValueSerializer serializer, INPUT* fp) {
+    return rep.unserialize(serializer, fp);
+  }
+
+  // The four methods below are DEPRECATED.
+  // Use serialize() and unserialize() for new code.
+  template <typename OUTPUT>
+  bool write_metadata(OUTPUT *fp)       { return rep.write_metadata(fp); }
+
+  template <typename INPUT>
+  bool read_metadata(INPUT *fp)         { return rep.read_metadata(fp); }
+
+  template <typename OUTPUT>
+  bool write_nopointer_data(OUTPUT *fp) { return rep.write_nopointer_data(fp); }
+
+  template <typename INPUT>
+  bool read_nopointer_data(INPUT *fp)   { return rep.read_nopointer_data(fp); }
+};
+
+template <class Val, class HashFcn, class EqualKey, class Alloc>
+inline void swap(sparse_hash_set<Val, HashFcn, EqualKey, Alloc>& hs1,
+                 sparse_hash_set<Val, HashFcn, EqualKey, Alloc>& hs2) {
+  hs1.swap(hs2);
+}
+
+_END_GOOGLE_NAMESPACE_
+
+#endif /* _SPARSE_HASH_SET_H_ */

src/includes/3thparty/sparsehash/template_util.h

@@ -0,0 +1,134 @@
+// Copyright 2005 Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ----
+//
+// Template metaprogramming utility functions.
+//
+// This code is compiled directly on many platforms, including client
+// platforms like Windows, Mac, and embedded systems.  Before making
+// any changes here, make sure that you're not breaking any platforms.
+//
+//
+// The names choosen here reflect those used in tr1 and the boost::mpl
+// library, there are similar operations used in the Loki library as
+// well.  I prefer the boost names for 2 reasons:
+// 1.  I think that portions of the Boost libraries are more likely to
+// be included in the c++ standard.
+// 2.  It is not impossible that some of the boost libraries will be
+// included in our own build in the future.
+// Both of these outcomes means that we may be able to directly replace
+// some of these with boost equivalents.
+//
+#ifndef BASE_TEMPLATE_UTIL_H_
+#define BASE_TEMPLATE_UTIL_H_
+
+#include "./internal/sparseconfig.h"
+_START_GOOGLE_NAMESPACE_
+
+// Types small_ and big_ are guaranteed such that sizeof(small_) <
+// sizeof(big_)
+typedef char small_;
+
+struct big_ {
+  char dummy[2];
+};
+
+// Identity metafunction.
+template <class T>
+struct identity_ {
+  typedef T type;
+};
+
+// integral_constant, defined in tr1, is a wrapper for an integer
+// value. We don't really need this generality; we could get away
+// with hardcoding the integer type to bool. We use the fully
+// general integer_constant for compatibility with tr1.
+
+template<class T, T v>
+struct integral_constant {
+  static const T value = v;
+  typedef T value_type;
+  typedef integral_constant<T, v> type;
+};
+
+template <class T, T v> const T integral_constant<T, v>::value;
+
+
+// Abbreviations: true_type and false_type are structs that represent boolean
+// true and false values. Also define the boost::mpl versions of those names,
+// true_ and false_.
+typedef integral_constant<bool, true>  true_type;
+typedef integral_constant<bool, false> false_type;
+typedef true_type  true_;
+typedef false_type false_;
+
+// if_ is a templatized conditional statement.
+// if_<cond, A, B> is a compile time evaluation of cond.
+// if_<>::type contains A if cond is true, B otherwise.
+template<bool cond, typename A, typename B>
+struct if_{
+  typedef A type;
+};
+
+template<typename A, typename B>
+struct if_<false, A, B> {
+  typedef B type;
+};
+
+
+// type_equals_ is a template type comparator, similar to Loki IsSameType.
+// type_equals_<A, B>::value is true iff "A" is the same type as "B".
+//
+// New code should prefer base::is_same, defined in base/type_traits.h.
+// It is functionally identical, but is_same is the standard spelling.
+template<typename A, typename B>
+struct type_equals_ : public false_ {
+};
+
+template<typename A>
+struct type_equals_<A, A> : public true_ {
+};
+
+// and_ is a template && operator.
+// and_<A, B>::value evaluates "A::value && B::value".
+template<typename A, typename B>
+struct and_ : public integral_constant<bool, (A::value && B::value)> {
+};
+
+// or_ is a template || operator.
+// or_<A, B>::value evaluates "A::value || B::value".
+template<typename A, typename B>
+struct or_ : public integral_constant<bool, (A::value || B::value)> {
+};
+
+
+_END_GOOGLE_NAMESPACE_
+
+#endif  // BASE_TEMPLATE_UTIL_H_

src/includes/3thparty/sparsehash/type_traits.h

@@ -0,0 +1,342 @@
+// Copyright (c) 2006, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// ----
+//
+// This code is compiled directly on many platforms, including client
+// platforms like Windows, Mac, and embedded systems.  Before making
+// any changes here, make sure that you're not breaking any platforms.
+//
+// Define a small subset of tr1 type traits. The traits we define are:
+//   is_integral
+//   is_floating_point
+//   is_pointer
+//   is_enum
+//   is_reference
+//   is_pod
+//   has_trivial_constructor
+//   has_trivial_copy
+//   has_trivial_assign
+//   has_trivial_destructor
+//   remove_const
+//   remove_volatile
+//   remove_cv
+//   remove_reference
+//   add_reference
+//   remove_pointer
+//   is_same
+//   is_convertible
+// We can add more type traits as required.
+
+#ifndef BASE_TYPE_TRAITS_H_
+#define BASE_TYPE_TRAITS_H_
+
+#include "./internal/sparseconfig.h"
+#include <utility>                  // For pair
+
+#include "./template_util.h"    // For true_type and false_type
+
+_START_GOOGLE_NAMESPACE_
+
+template <class T> struct is_integral;
+template <class T> struct is_floating_point;
+template <class T> struct is_pointer;
+// MSVC can't compile this correctly, and neither can gcc 3.3.5 (at least)
+#if !defined(_MSC_VER) && !(defined(__GNUC__) && __GNUC__ <= 3)
+// is_enum uses is_convertible, which is not available on MSVC.
+template <class T> struct is_enum;
+#endif
+template <class T> struct is_reference;
+template <class T> struct is_pod;
+template <class T> struct has_trivial_constructor;
+template <class T> struct has_trivial_copy;
+template <class T> struct has_trivial_assign;
+template <class T> struct has_trivial_destructor;
+template <class T> struct remove_const;
+template <class T> struct remove_volatile;
+template <class T> struct remove_cv;
+template <class T> struct remove_reference;
+template <class T> struct add_reference;
+template <class T> struct remove_pointer;
+template <class T, class U> struct is_same;
+#if !defined(_MSC_VER) && !(defined(__GNUC__) && __GNUC__ <= 3)
+template <class From, class To> struct is_convertible;
+#endif
+
+// is_integral is false except for the built-in integer types. A
+// cv-qualified type is integral if and only if the underlying type is.
+template <class T> struct is_integral : false_type { };
+template<> struct is_integral<bool> : true_type { };
+template<> struct is_integral<char> : true_type { };
+template<> struct is_integral<unsigned char> : true_type { };
+template<> struct is_integral<signed char> : true_type { };
+#if defined(_MSC_VER)
+// wchar_t is not by default a distinct type from unsigned short in
+// Microsoft C.
+// See http://msdn2.microsoft.com/en-us/library/dh8che7s(VS.80).aspx
+template<> struct is_integral<__wchar_t> : true_type { };
+#else
+template<> struct is_integral<wchar_t> : true_type { };
+#endif
+template<> struct is_integral<short> : true_type { };
+template<> struct is_integral<unsigned short> : true_type { };
+template<> struct is_integral<int> : true_type { };
+template<> struct is_integral<unsigned int> : true_type { };
+template<> struct is_integral<long> : true_type { };
+template<> struct is_integral<unsigned long> : true_type { };
+#ifdef HAVE_LONG_LONG
+template<> struct is_integral<long long> : true_type { };
+template<> struct is_integral<unsigned long long> : true_type { };
+#endif
+template <class T> struct is_integral<const T> : is_integral<T> { };
+template <class T> struct is_integral<volatile T> : is_integral<T> { };
+template <class T> struct is_integral<const volatile T> : is_integral<T> { };
+
+// is_floating_point is false except for the built-in floating-point types.
+// A cv-qualified type is integral if and only if the underlying type is.
+template <class T> struct is_floating_point : false_type { };
+template<> struct is_floating_point<float> : true_type { };
+template<> struct is_floating_point<double> : true_type { };
+template<> struct is_floating_point<long double> : true_type { };
+template <class T> struct is_floating_point<const T>
+    : is_floating_point<T> { };
+template <class T> struct is_floating_point<volatile T>
+    : is_floating_point<T> { };
+template <class T> struct is_floating_point<const volatile T>
+    : is_floating_point<T> { };
+
+// is_pointer is false except for pointer types. A cv-qualified type (e.g.
+// "int* const", as opposed to "int const*") is cv-qualified if and only if
+// the underlying type is.
+template <class T> struct is_pointer : false_type { };
+template <class T> struct is_pointer<T*> : true_type { };
+template <class T> struct is_pointer<const T> : is_pointer<T> { };
+template <class T> struct is_pointer<volatile T> : is_pointer<T> { };
+template <class T> struct is_pointer<const volatile T> : is_pointer<T> { };
+
+#if !defined(_MSC_VER) && !(defined(__GNUC__) && __GNUC__ <= 3)
+
+namespace internal {
+
+template <class T> struct is_class_or_union {
+  template <class U> static small_ tester(void (U::*)());
+  template <class U> static big_ tester(...);
+  static const bool value = sizeof(tester<T>(0)) == sizeof(small_);
+};
+
+// is_convertible chokes if the first argument is an array. That's why
+// we use add_reference here.
+template <bool NotUnum, class T> struct is_enum_impl
+    : is_convertible<typename add_reference<T>::type, int> { };
+
+template <class T> struct is_enum_impl<true, T> : false_type { };
+
+}  // namespace internal
+
+// Specified by TR1 [4.5.1] primary type categories.
+
+// Implementation note:
+//
+// Each type is either void, integral, floating point, array, pointer,
+// reference, member object pointer, member function pointer, enum,
+// union or class. Out of these, only integral, floating point, reference,
+// class and enum types are potentially convertible to int. Therefore,
+// if a type is not a reference, integral, floating point or class and
+// is convertible to int, it's a enum. Adding cv-qualification to a type
+// does not change whether it's an enum.
+//
+// Is-convertible-to-int check is done only if all other checks pass,
+// because it can't be used with some types (e.g. void or classes with
+// inaccessible conversion operators).
+template <class T> struct is_enum
+    : internal::is_enum_impl<
+          is_same<T, void>::value ||
+              is_integral<T>::value ||
+              is_floating_point<T>::value ||
+              is_reference<T>::value ||
+              internal::is_class_or_union<T>::value,
+          T> { };
+
+template <class T> struct is_enum<const T> : is_enum<T> { };
+template <class T> struct is_enum<volatile T> : is_enum<T> { };
+template <class T> struct is_enum<const volatile T> : is_enum<T> { };
+
+#endif
+
+// is_reference is false except for reference types.
+template<typename T> struct is_reference : false_type {};
+template<typename T> struct is_reference<T&> : true_type {};
+
+
+// We can't get is_pod right without compiler help, so fail conservatively.
+// We will assume it's false except for arithmetic types, enumerations,
+// pointers and cv-qualified versions thereof. Note that std::pair<T,U>
+// is not a POD even if T and U are PODs.
+template <class T> struct is_pod
+ : integral_constant<bool, (is_integral<T>::value ||
+                            is_floating_point<T>::value ||
+#if !defined(_MSC_VER) && !(defined(__GNUC__) && __GNUC__ <= 3)
+                            // is_enum is not available on MSVC.
+                            is_enum<T>::value ||
+#endif
+                            is_pointer<T>::value)> { };
+template <class T> struct is_pod<const T> : is_pod<T> { };
+template <class T> struct is_pod<volatile T> : is_pod<T> { };
+template <class T> struct is_pod<const volatile T> : is_pod<T> { };
+
+
+// We can't get has_trivial_constructor right without compiler help, so
+// fail conservatively. We will assume it's false except for: (1) types
+// for which is_pod is true. (2) std::pair of types with trivial
+// constructors. (3) array of a type with a trivial constructor.
+// (4) const versions thereof.
+template <class T> struct has_trivial_constructor : is_pod<T> { };
+template <class T, class U> struct has_trivial_constructor<std::pair<T, U> >
+  : integral_constant<bool,
+                      (has_trivial_constructor<T>::value &&
+                       has_trivial_constructor<U>::value)> { };
+template <class A, int N> struct has_trivial_constructor<A[N]>
+  : has_trivial_constructor<A> { };
+template <class T> struct has_trivial_constructor<const T>
+  : has_trivial_constructor<T> { };
+
+// We can't get has_trivial_copy right without compiler help, so fail
+// conservatively. We will assume it's false except for: (1) types
+// for which is_pod is true. (2) std::pair of types with trivial copy
+// constructors. (3) array of a type with a trivial copy constructor.
+// (4) const versions thereof.
+template <class T> struct has_trivial_copy : is_pod<T> { };
+template <class T, class U> struct has_trivial_copy<std::pair<T, U> >
+  : integral_constant<bool,
+                      (has_trivial_copy<T>::value &&
+                       has_trivial_copy<U>::value)> { };
+template <class A, int N> struct has_trivial_copy<A[N]>
+  : has_trivial_copy<A> { };
+template <class T> struct has_trivial_copy<const T> : has_trivial_copy<T> { };
+
+// We can't get has_trivial_assign right without compiler help, so fail
+// conservatively. We will assume it's false except for: (1) types
+// for which is_pod is true. (2) std::pair of types with trivial copy
+// constructors. (3) array of a type with a trivial assign constructor.
+template <class T> struct has_trivial_assign : is_pod<T> { };
+template <class T, class U> struct has_trivial_assign<std::pair<T, U> >
+  : integral_constant<bool,
+                      (has_trivial_assign<T>::value &&
+                       has_trivial_assign<U>::value)> { };
+template <class A, int N> struct has_trivial_assign<A[N]>
+  : has_trivial_assign<A> { };
+
+// We can't get has_trivial_destructor right without compiler help, so
+// fail conservatively. We will assume it's false except for: (1) types
+// for which is_pod is true. (2) std::pair of types with trivial
+// destructors. (3) array of a type with a trivial destructor.
+// (4) const versions thereof.
+template <class T> struct has_trivial_destructor : is_pod<T> { };
+template <class T, class U> struct has_trivial_destructor<std::pair<T, U> >
+  : integral_constant<bool,
+                      (has_trivial_destructor<T>::value &&
+                       has_trivial_destructor<U>::value)> { };
+template <class A, int N> struct has_trivial_destructor<A[N]>
+  : has_trivial_destructor<A> { };
+template <class T> struct has_trivial_destructor<const T>
+  : has_trivial_destructor<T> { };
+
+// Specified by TR1 [4.7.1]
+template<typename T> struct remove_const { typedef T type; };
+template<typename T> struct remove_const<T const> { typedef T type; };
+template<typename T> struct remove_volatile { typedef T type; };
+template<typename T> struct remove_volatile<T volatile> { typedef T type; };
+template<typename T> struct remove_cv {
+  typedef typename remove_const<typename remove_volatile<T>::type>::type type;
+};
+
+
+// Specified by TR1 [4.7.2] Reference modifications.
+template<typename T> struct remove_reference { typedef T type; };
+template<typename T> struct remove_reference<T&> { typedef T type; };
+
+template <typename T> struct add_reference { typedef T& type; };
+template <typename T> struct add_reference<T&> { typedef T& type; };
+
+// Specified by TR1 [4.7.4] Pointer modifications.
+template<typename T> struct remove_pointer { typedef T type; };
+template<typename T> struct remove_pointer<T*> { typedef T type; };
+template<typename T> struct remove_pointer<T* const> { typedef T type; };
+template<typename T> struct remove_pointer<T* volatile> { typedef T type; };
+template<typename T> struct remove_pointer<T* const volatile> {
+  typedef T type; };
+
+// Specified by TR1 [4.6] Relationships between types
+template<typename T, typename U> struct is_same : public false_type { };
+template<typename T> struct is_same<T, T> : public true_type { };
+
+// Specified by TR1 [4.6] Relationships between types
+#if !defined(_MSC_VER) && !(defined(__GNUC__) && __GNUC__ <= 3)
+namespace internal {
+
+// This class is an implementation detail for is_convertible, and you
+// don't need to know how it works to use is_convertible. For those
+// who care: we declare two different functions, one whose argument is
+// of type To and one with a variadic argument list. We give them
+// return types of different size, so we can use sizeof to trick the
+// compiler into telling us which function it would have chosen if we
+// had called it with an argument of type From.  See Alexandrescu's
+// _Modern C++ Design_ for more details on this sort of trick.
+
+template <typename From, typename To>
+struct ConvertHelper {
+  static small_ Test(To);
+  static big_ Test(...);
+  static From Create();
+};
+}  // namespace internal
+
+// Inherits from true_type if From is convertible to To, false_type otherwise.
+template <typename From, typename To>
+struct is_convertible
+    : integral_constant<bool,
+                        sizeof(internal::ConvertHelper<From, To>::Test(
+                                  internal::ConvertHelper<From, To>::Create()))
+                        == sizeof(small_)> {
+};
+#endif
+
+_END_GOOGLE_NAMESPACE_
+
+// Right now these macros are no-ops, and mostly just document the fact
+// these types are PODs, for human use.  They may be made more contentful
+// later.  The typedef is just to make it legal to put a semicolon after
+// these macros.
+#define DECLARE_POD(TypeName) typedef int Dummy_Type_For_DECLARE_POD
+#define DECLARE_NESTED_POD(TypeName) DECLARE_POD(TypeName)
+#define PROPAGATE_POD_FROM_TEMPLATE_ARGUMENT(TemplateName)             \
+    typedef int Dummy_Type_For_PROPAGATE_POD_FROM_TEMPLATE_ARGUMENT
+#define ENFORCE_POD(TypeName) typedef int Dummy_Type_For_ENFORCE_POD
+
+#endif  // BASE_TYPE_TRAITS_H_

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