设计模式10——flyweight模式

 

用例：

//flyweight.cpp
//享元模式：运用共享技术有效地支持大量细粒度对象。

#include "gtest/gtest.h"
#include <map>

class Flyweight
{
public:
    Flyweight() {}
    virtual ~Flyweight() {}
    virtual int Operation() = 0;
};


class ConcreteFlyweight1 : public Flyweight
{
public:
    ConcreteFlyweight1() {}
    virtual ~ConcreteFlyweight1() {}

    int Operation()
    {
        return 1;
    }
};

class ConcreteFlyweight2 : public Flyweight
{
public:
    ConcreteFlyweight2() {}
    virtual ~ConcreteFlyweight2() {}

    int Operation()
    {
        return 2;
    }
};



class FlyweightFactory
{
public:
    FlyweightFactory()
    {
        flyweight['1'] = new ConcreteFlyweight1;
        flyweight['2'] = new ConcreteFlyweight2;
    }

    virtual ~FlyweightFactory() 
    {
        delete flyweight['1'];
        delete flyweight['2'];
    }

    Flyweight* GetFlyweight(char key)
    {
        return flyweight[key];
    }

private:
    std::map<char,Flyweight*> flyweight;
};

TEST(Flyweight,flyweight)
{
    FlyweightFactory* factory = new FlyweightFactory();

    Flyweight* f1 = factory->GetFlyweight('1');
    EXPECT_EQ(1,f1->Operation());

    Flyweight* f2 = factory->GetFlyweight('2');
    EXPECT_EQ(2,f2->Operation());

}