Downgrade projects to C++17.

PowerUtils/byteswap.h

@@ -0,0 +1,25 @@
+#pragma once 
+
+#include <cassert>
+
+template<typename T>
+inline T ByteSwap(T value)
+{
+    if constexpr (sizeof(T) == 1)
+        return value;
+    else if constexpr (sizeof(T) == 2)
+        return static_cast<T>(__builtin_bswap16(static_cast<uint16_t>(value)));
+    else if constexpr (sizeof(T) == 4)
+        return static_cast<T>(__builtin_bswap32(static_cast<uint32_t>(value)));
+    else if constexpr (sizeof(T) == 8)
+        return static_cast<T>(__builtin_bswap64(static_cast<uint64_t>(value)));
+
+    assert(false && "Unexpected byte size.");
+    return value;
+}
+
+template<typename T>
+inline void ByteSwapInplace(T& value)
+{
+    value = ByteSwap(value);
+}