【设计模式】之四Command

Type: Behavioral

#include <iostream>#include <vector>using namespace std;class Receiver{public:    void action()    {        cout <<"Receiver Action"<<endl;;    }};class Command{public:    virtual void execute()=0;};class ConcreteCommand: public Command{public:    ConcreteCommand(Receiver* pReceiver): m_pReceiver(pReceiver){};    void execute()    {        m_pReceiver->action();    };private:    Receiver* m_pReceiver;};class Invoker{public:void addCommand(Command *pCommand){        mCommand.push_back(pCommand);        pCommand->execute();    }private:vector<Command*> mCommand;};int main(){Receiver* pReceiver = new Receiver();Command*  pCommand  = new ConcreteCommand(pReceiver);Invoker*  pInvoker  = new Invoker();    pInvoker->addCommand(pCommand);system("pause");return 0;}

命令模式将请求包装成Object，这样能够是clients接收不同的请求作为参数，支持undo操作。例子里undo没实现。