【C++设计模式】享元模式

#ifndef __FLYWEIGHT_H__
#define __FLYWEIGHT_H__

#include 
#include 

#include "Flyweight.h"

FlyWeight::FlyWeight()
{

}

FlyWeight::FlyWeight(std::string key) : m_key(key)
{

}

void FlyWeight::Operate(int value)
{
	printf("ConcreteFlyWeight m_key[%s], value[%d]\n", m_key.c_str(), value);
}

FlyWeight * FlyWeightFactory::GetFlyWeight(std::string key)
{
	std::map::iterator it = m_flymap.find(key);
	if (it != m_flymap.end())
	{
		return it->second;
	}

	FlyWeight * fly = new FlyWeight(key);
	m_flymap.insert(std::map::value_type(key,fly));

	return fly;
}

FlyWeightFactory::FlyWeightFactory()
{

}

FlyWeightFactory::~FlyWeightFactory()
{
	std::map::iterator iter;
	for (iter = m_flymap.begin(); iter != m_flymap.end(); iter++)
	{
		if (iter->second != NULL)
		{
			delete iter->second;
			iter->second = NULL;
		}
	}
}

void TestFlyWeight()
{
	FlyWeightFactory * flyFactory = new FlyWeightFactory();

	FlyWeight * fly1 = flyFactory->GetFlyWeight("X");
	FlyWeight * fly2 = flyFactory->GetFlyWeight("Y");
	FlyWeight * fly3 = flyFactory->GetFlyWeight("X");
	FlyWeight * fly4 = flyFactory->GetFlyWeight("X");

	fly1->Operate(11);

	fly4->Operate(15);

	delete flyFactory;
}