大话设计模式享元模式c++实现

享元模式

其他二十三种设计模式

#include<iostream>
#include<map>

using namespace std;

//享元模式

class User {
    
    
public:
	User(string _name) {
    
    
		this->name = _name;
	}
	string GetName() {
    
    
		return name;
	}

private:
	string name;
};

class WebSite{
    
    
public:
	virtual ~WebSite() = default;
	virtual void Use(User _user) = 0;
};

class ConcreteWebSite :public WebSite {
    
    
public:
	ConcreteWebSite(string _name) {
    
    
		this->name = _name;
	}
	void Use(User _user) override{
    
    
		cout << "网站分类: " << name << "   用户: " << _user.GetName() << endl;
	}

private:
	string name;
};

class WebSiteFactory {
    
    
public:
	~WebSiteFactory() {
    
    
		for (auto it = map1.begin(); it != map1.end(); ++it)
			delete it->second;
	}

	WebSite* GetWebSiteCategory(string _key) {
    
    
		for (auto it = map1.begin(); it != map1.end(); ++it) {
    
    
			if (it->first == _key)
				return it->second;
		}
		WebSite* website = new ConcreteWebSite(_key);
		map1.insert(pair<string, WebSite*>(_key, website));
		return website;
	}
	int GetWebSiteCount() {
    
    
		return map1.size();
	}

private:
	map<string, WebSite*> map1;
};

void test1() {
    
    
	WebSiteFactory factory;

	WebSite* fx = factory.GetWebSiteCategory("产品展示");
	fx->Use(User("小菜"));
	WebSite* fy = factory.GetWebSiteCategory("产品展示");
	fy->Use(User("大鸟"));
	WebSite* fz = factory.GetWebSiteCategory("产品展示");
	fz->Use(User("娇娇"));

	WebSite* fl = factory.GetWebSiteCategory("博客");
	fl->Use(User("老顽童"));
	WebSite* fm = factory.GetWebSiteCategory("博客");
	fm->Use(User("桃谷六仙"));
	WebSite* fn = factory.GetWebSiteCategory("博客");
	fn->Use(User("南海鳄神"));

    cout << "网站分类总数: " << factory.GetWebSiteCount() << endl;
}

int main()
{
    
    
	test1();
	system("pause");
	return 0;
}