26 lines
584 B
C
26 lines
584 B
C
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#ifndef __Observer_H
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#define __Observer_H
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#include <list>
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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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#endif
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