学以致用C++设计模式 之 “命令模式”

#include<iostream>

using namespace std;

//需求抽象类
class abstractXQ {
public:
	virtual void find() = 0;	//找到对应程序员
	virtual void add() = 0;		//新增任务
	virtual void del() = 0;		//删除任务
	virtual void change() = 0;	//修改任务
	virtual void show() = 0;	//发布代码
};

//UI程序员
class UI :public abstractXQ {
public:
	void find() { cout << "找到UI程序员" << endl; }
	void add() { cout << "新增UI界面" << endl; }
	void del() { cout << "UI界面删除" << endl; }
	void change() { cout << "UI界面修改" << endl; }
	void show() { cout << "UI代码发布" << endl; }
};

//后端
class BK :public abstractXQ {
public:
	void find() { cout << "找到后端程序员" << endl; }
	void add() { cout << "新增后端功能" << endl; }
	void del() { cout << "后端功能下架" << endl; }
	void change() { cout << "后端功能修改" << endl; }
	void show() { cout << "后端代码发布" << endl; }
};

//需求
class XQ :public abstractXQ {
public:
	void find() { cout << "找到需求分析" << endl; }
	void add() { cout << "新增需求" << endl; }
	void del() { cout << "需求删减" << endl; }
	void change() { cout << "需求修改" << endl; }
	void show() { cout << "需求分析发布" << endl; }
};

//任务调度基类
class Command {
protected:
	//我想知道，这个保护数据的意义在哪里？
	//公有继承的子类不是照样用吗？
	UI* ui = new UI();
	BK* bk = new BK();
	XQ* xq = new XQ();

public:
	virtual void execute() = 0;
};

//增加需求
class add_XQ :public Command {	//使用保护继承，会导致子类无法转换为父类对象
	void execute(){
		xq->find();
		xq->add();
		xq->show();
	}
};

//删除界面
class del_UI :public Command {
	void execute() {
		ui->find();
		ui->del();
		ui->show();
	}
};

//项目组长
class master {
private:
	Command* command;
public:
	void set_Comment(Command* c) { this->command = c; }
	void get_order() { this->command->execute(); }
};

//客户端类
int main()
{
	master* m = new master();
	Command* c1 = new add_XQ();
	Command* c2 = new del_UI();
	m->set_Comment(c1);
	m->get_order();

	m->set_Comment(c2);
	m->get_order();
	return 0;
}