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#include <iostream> |
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#include <string> |
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#include <vector> |
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#include <algorithm> |
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using namespace std; |
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class button; |
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struct button_listener{ |
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button_listener(){} |
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virtual ~button_listener(){} |
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virtual void button_clicked(button* btn)=0; |
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}; |
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class button{ |
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private: |
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vector<button_listener*> listeners; |
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typedef vector<button_listener*>::iterator bit_type; |
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string name; |
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public: |
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string get_name(){return name;}; |
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button(string n):name(n){} |
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~button(){} |
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void add_button_listener(button_listener* bls){ |
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listeners.push_back(bls); |
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} |
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void remove_button_listener(button_listener* bls){ |
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listeners.erase(remove( |
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listeners.begin(),listeners.end(),bls), |
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listeners.end()); |
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} |
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void run(){ |
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for(bit_type it=listeners.begin();it!=listeners.end();++it){ |
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button_listener* bls = *it; |
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bls->button_clicked(this); |
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} |
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} |
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}; |
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class my_button_listener:public button_listener{ |
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private: |
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int i; |
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public: |
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my_button_listener(int ii):i(ii){} |
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void button_clicked(button* btn){ |
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cout<<btn->get_name()<<" "<<i<<endl; |
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} |
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}; |
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int main(){ |
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button* btn = new button("nihao"); |
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button_listener* bls1 = new my_button_listener(1); |
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button_listener* bls2 = new my_button_listener(2); |
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|
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btn->add_button_listener(bls1); |
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btn->add_button_listener(bls2); |
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btn->run(); |
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btn->remove_button_listener(bls1); |
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btn->run(); |
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delete btn; |
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delete bls1; |
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delete bls2; |
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return 0; |
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} |
本文转自博客园知识天地的博客，原文链接：c++ 观察者模式，如需转载请自行联系原博主。
