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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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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。