命令【设计模式】

知识点

命令（command）、动作（action）、事务（Transaction）

知识内容

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，以及支持可撤销的操作。

示例

#include<iostream>

using namespace std;

class Receiver
{
    public:
      Receiver() {}
      void Action()
      {
        cout << "exec action in Receiver..." << endl;
      }
};

class Command
{
  public:
    virtual void Execute() = 0;
};

class ConcreteCommand:public Command
{
  private:
    Receiver receiver;
  public:
    ConcreteCommand(Receiver myReceiver):
      receiver(myReceiver) {}
    virtual void Execute()
    {
        cout << "exec command in ConcreteCommand" << endl;
        receiver.Action();
    }
};
int main()
{
  Receiver* receiver = new Receiver();
  Command* command = new ConcreteCommand(*receiver);
  command -> Execute();
  return 0;
}

链接

https://github.com/xierensong/learngit/blob/master/DPattern/21/1.cpp