设计模式 - Command

意图：将一个请求封装为一个对象，从而使你可用不同的请求对客户进行参数化；对请求排队或记录请求日志，以及支持可撤消的操作。

class Receiver
{
public:Receiver(){}virtual ~Receiver(){}virtual void Action(){cout<<"Receiver::Action()"<<endl;}
};class Command
{
public:Command(){}virtual ~Command(){}virtual void Execute() = 0;
};class ConcreteCommand: public Command
{
public:ConcreteCommand(Receiver* receiver){this->receiver = receiver;}~ConcreteCommand(){}void Execute(){cout<<"ConcreteCommand::Execute()"<<endl;receiver->Action();}private:Receiver* receiver;
};class Invoker
{
public:Invoker(Command* cmd){this->cmd = cmd;}~Invoker(){}void Invoke(){cmd->Execute();}private:Command* cmd;
};