设计模式:bridge模式
作者:互联网
目的:将“类的功能层次结构”和“类的实现层次结构”分类
类的功能层次:通过类的继承添加功能(添加普通函数)
类的实现层次:通过类的继承实现虚函数
理解:和适配器模式中的桥接方法相同
例子:
class DisplayImpl { public: virtual void open() = 0; virtual void print() = 0; virtual void close() = 0; }; class StringDisplayImpl: public DisplayImpl //实现性扩展 { public: void open() { cout << "open()" << endl; } void print() { cout << "print()" << endl; } void close() { cout << "close()" << endl; } };
class Display { DisplayImpl* pImpl; //桥接的核心代码 public: Display(DisplayImpl* pImpl) { this->pImpl = pImpl; } void print() { pImpl->open(); pImpl->print(); pImpl->close(); } }; class MultiDisplay: public Display //功能性扩展 { public: MultiDisplay(DisplayImpl* pImpl): Display(pImpl) {} void multiPrint() { for(int i=0; i<5; i++) { print(); } } };
int main() { Display* d = new Display(new StringDisplayImpl()); d->print(); cout << endl; MultiDisplay* md = new MultiDisplay(new StringDisplayImpl()); md->multiPrint(); return 0; }
标签:bridge,void,模式,pImpl,public,print,DisplayImpl,设计模式,Display 来源: https://www.cnblogs.com/chusiyong/p/11433290.html