设计模式——享元模式（C++实现）

#include <iostream>
#include <string>
#include <map>
#include <vector>
#include <iterator>
#include <algorithm>

using namespace std;

class User
{
public:
        User(string strName): m_strName(strName)
        {

        }

        string GetName() const
        {
                return m_strName;
        }

private:
        string m_strName;
};

class WebSite
{
public:
        virtual void Use(const User* stUser) = 0;

};

class ConcreteWebSite: public WebSite
{
public:
        ConcreteWebSite(string strName): m_strName(strName)
        {

        }

        virtual void Use(const User* stUser)
        {
                cout<< "网站分类："<< m_strName<< "	 用户："<< stUser->GetName()<< endl;
        }

private:
        string m_strName;

};

class WebSiteFactory
{

public:
        WebSite* GetWebSiteCategory(string strKey)
        {
                if (mapFlyWeights.find(strKey) != mapFlyWeights.end())
                {
                        return mapFlyWeights[strKey];
                }
                else
                {
                        mapFlyWeights.insert(pair<string, WebSite*>(strKey, new ConcreteWebSite(strKey)));
                        return mapFlyWeights[strKey];
                }
        }

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

int main(int argc, char* argv[])
{
        WebSiteFactory* f = new WebSiteFactory();

        WebSite* fx = f->GetWebSiteCategory("产品展示");
        fx->Use(new User("小菜"));


        WebSite* fy = f->GetWebSiteCategory("产品展示");
        fy->Use(new User("大鸟"));


        WebSite* fz = f->GetWebSiteCategory("博客");
        fz->Use(new User("xxxxx"));


        WebSite* fm = f->GetWebSiteCategory("博客");
        fm->Use(new User("OOOOOO"));

        return 0;
}

[root@ ~/learn_code/design_pattern/22_fly_weight]$ ./flyWeight       
网站分类：产品展示       用户：小菜
网站分类：产品展示       用户：大鸟
网站分类：博客   用户：xxxxx
网站分类：博客   用户：OOOOOO