88 lines
2.3 KiB
C++
88 lines
2.3 KiB
C++
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// ================================================================
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// Infrastructure Layer
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// ================================================================
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#include <iostream>
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#include <list>
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#include <string>
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using namespace std;
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class Subject;
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class Observer{
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private: Subject* S;
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protected: Subject* getSubject() const { return S; }
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public: Observer (Subject* s);
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virtual ~Observer ();
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virtual void update () = 0;
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};
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class Subject{
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private: list<Observer*> L;
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protected: virtual void notify ();
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public: Subject () { }
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virtual ~Subject() { }
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virtual void insert (Observer* s) { L.push_front(s); }
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virtual void remove (Observer* s) { L.remove(s); }
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};
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void Subject::notify (){
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for (list<Observer*>::iterator i=L.begin(); i!=L.end(); ++i)
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(*i)->update();
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}
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Observer::Observer (Subject* s) : S(s){
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getSubject()->insert(this);
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}
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Observer::~Observer (){
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getSubject()->remove(this);
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}
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// ================================================================
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// DomainLayer
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// ================================================================
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class Element{
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public:
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virtual ~Element () {}
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virtual void draw () = 0;
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virtual string name () = 0;
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};
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class Ninja : public Element, public Subject{
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private: string Name;
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int AantalLevens;
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public: Ninja (string n) : Name(n), AantalLevens(1) { }
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virtual void draw () { cout << name() << AantalLevens << endl; }
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virtual string name () { return Name; }
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virtual int aantalLevens () { return AantalLevens; }
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virtual void incLevens () { AantalLevens++; notify(); }
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virtual void decLevens () { AantalLevens--; notify(); }
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};
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// ================================================================
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// Interfacelayer
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// ================================================================
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class NinjaWindow : public Observer{
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private: Ninja* N;
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public: NinjaWindow (Ninja* n) : Observer(n) {}
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virtual ~NinjaWindow () {}
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//virtual void draw() { N.draw(); }
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virtual void update(){dynamic_cast<Ninja*>(getSubject())->draw();}
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};
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int main( ){
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Ninja h("Henk"), j("Joop");
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NinjaWindow hW(&h), jW(&j);
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h.incLevens();
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h.incLevens();
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j.incLevens();
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j.incLevens();
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j.incLevens();
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h.incLevens();
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return 0;
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}
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// ================================================================
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