/**
 * @name 命令模式
 * @brief: 将请求封装为对象
 * @note 场景：GUI 按钮操作、撤销/重做功能、任务队列
 */

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

class Light {
public:
    void turnOn() {}
};

class LightOnCommand : public Command {
    Light* light;
public:
    void execute() override { light->turnOn(); }
};

class RemoteControl {
    Command* command;
public:
    void setCommand(Command* cmd) { command = cmd; }
    void pressButton() { command->execute(); }
};

// 使用
int main()
{
    RemoteControl remote;
    remote.setCommand(new LightOnCommand());
    remote.pressButton();
}