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#ifndef SUBJECT_HPP
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#define SUBJECT_HPP
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#include <list>
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class Observer;
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class Subject
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{
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public:
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virtual ~Subject();
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virtual void attach( Observer* );
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virtual void detach( Observer* );
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virtual void notify();
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private:
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std::list< Observer* > m_observers;
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};
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#endif // SUBJECT_HPP
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