C++设计模式——享元模式

//Character.h
class Character  
{
public:
    virtual ~Character();

    virtual void SetSize(int, int) = 0;
    virtual void Display() = 0;
protected:
    Character();
    char m_chSymbol;
    int m_nWeight;
    int m_nHeight;
};

//Character.cpp
#include "stdafx.h"
#include "Character.h"

Character::Character()
{

}

Character::~Character()
{

}

//CharacterA.h
#include "Character.h"

class CharacterA : public Character
{
public:
    CharacterA();
    virtual ~CharacterA();

    void SetSize(int, int);
    void Display();
};

//CharacterA.cpp
#include "stdafx.h"
#include "CharacterA.h"
#include <iostream>

using namespace std;

CharacterA::CharacterA()
{
    this->m_chSymbol = 'A';
    this->m_nWeight = 100;
    this->m_nHeight = 200;
}

CharacterA::~CharacterA()
{

}

void CharacterA::SetSize(int nWeight, int nHeight)
{
    this->m_nWeight = nWeight;
    this->m_nHeight = nHeight;
}

void CharacterA::Display()
{
    cout << "CharacterA：" << m_chSymbol << "(" << m_nWeight << "," << m_nHeight << ")" << endl;
}

//CharacterB.h
#include "Character.h"

class CharacterB : public Character
{
public:
    CharacterB();
    virtual ~CharacterB();

    void SetSize(int, int);
    void Display();
};

//CharacterB.cpp
#include "stdafx.h"
#include "CharacterB.h"
#include <iostream>

using namespace std;

CharacterB::CharacterB()
{
    this->m_chSymbol = 'B';
    this->m_nWeight = 100;
    this->m_nHeight = 200;
}

CharacterB::~CharacterB()
{

}

void CharacterB::SetSize(int nWeight, int nHeight)
{
    this->m_nWeight = nWeight;
    this->m_nHeight = nHeight;
}

void CharacterB::Display()
{
    cout << "CharacterB：" << m_chSymbol << "(" << m_nWeight << "," << m_nHeight << ")" << endl;
}

//CharacterFactory.h
#include <map>

class Character;
class CharacterFactory  
{
public:
    CharacterFactory();
    virtual ~CharacterFactory();

    Character* GetCharacter(char);
private:
    std::map<char, Character*> m_mChar;
};

//CharacterFactory.cpp
#include "stdafx.h"
#include "CharacterFactory.h"
#include "CharacterA.h"
#include "CharacterB.h"

using namespace std;

CharacterFactory::CharacterFactory()
{
    m_mChar.insert(make_pair<char, Character*>('A', new CharacterA));
    m_mChar.insert(make_pair<char, Character*>('B', new CharacterB));
}

CharacterFactory::~CharacterFactory()
{

}

Character* CharacterFactory::GetCharacter(char chIn)
{
    map<char, Character*>::iterator it = m_mChar.find(chIn);
    if(it != m_mChar.end())
    {
       return (Character*)it->second;
    }

    return NULL;
}

//main.cpp
#include "stdafx.h"
#include "CharacterFactory.h"
#include "Character.h"

int main(int argc, char* argv[])
{
    CharacterFactory* pFactory = new CharacterFactory;
    Character* pChar = pFactory->GetCharacter('A');
    pChar->Display();
    pChar = pFactory->GetCharacter('B');
    pChar->SetSize(500, 800);
    pChar->Display();

    return 0;
}