设计模式-Bridge（结构型模式）-用于客户需求较多，频繁对类进行添加修改的情形,将抽象类与具体实现类分开

以下代码来源： 设计模式精解－GoF 23种设计模式解析附C++实现源码

//AbstractionImp.h

#pragma once
class AbstractionImp
{
public:
    virtual ~AbstractionImp();
    virtual void Operation() = ;
protected:
    AbstractionImp();
private:
};

class ConcreateAbstractionImpA :public AbstractionImp
{
public:
    ConcreateAbstractionImpA();
    ~ConcreateAbstractionImpA();
    virtual void Operation();
protected:
private:
};

class ConcreateAbstractionImpB :public AbstractionImp
{
public:
    ConcreateAbstractionImpB();
    ~ConcreateAbstractionImpB();
    virtual void Operation();
protected:
private:
};

//Abstraction.cpp

#include"AbstractionImp.h"
#include<iostream>
AbstractionImp::AbstractionImp(){}
AbstractionImp::~AbstractionImp(){}
void AbstractionImp::Operation()
{
    std::cout << "AbstractionImp..." << std::endl;
}
ConcreateAbstractionImpA::ConcreateAbstractionImpA(){}
ConcreateAbstractionImpA::~ConcreateAbstractionImpA(){}
void ConcreateAbstractionImpA::Operation()
{
    std::cout << "ConcreateAbstractionImpA..." << std::endl;
}
ConcreateAbstractionImpB::ConcreateAbstractionImpB(){}
ConcreateAbstractionImpB::~ConcreateAbstractionImpB(){}
void ConcreateAbstractionImpB::Operation()
{
    std::cout << "ConcreateAbstractionImpB..." << std::endl;
}

//Abstraction.h

#pragma once
class AbstractionImp;
class Abstraction {
public:
    virtual ~Abstraction();
    virtual void Operation() = ;
protected:
    Abstraction();
private:

};
class RefinedAbstraction :public Abstraction
{
public:
    RefinedAbstraction(AbstractionImp* imp);
    ~RefinedAbstraction();
    void Operation();
protected:
private:
    AbstractionImp* _imp;
};

//Abstraction.cpp

#include"Abstraction.h"
#include"AbstractionImp.h"
#include<iostream>

Abstraction::Abstraction(){}
Abstraction::~Abstraction(){}
RefinedAbstraction::RefinedAbstraction(AbstractionImp* imp)
{
    _imp = imp;
}
RefinedAbstraction::~RefinedAbstraction(){}
void RefinedAbstraction::Operation()
{
    _imp->Operation();
}

//main.cpp

#include"Abstraction.h"
#include"AbstractionImp.h"
#include<string>

int main(int args, char* argv)
{
    AbstractionImp* impA = new ConcreateAbstractionImpA();
    Abstraction* abs = new RefinedAbstraction(impA);
    abs->Operation();
    AbstractionImp* impB = new ConcreateAbstractionImpB();
    Abstraction* abs1 = new RefinedAbstraction(impB);
    abs1->Operation();
    getchar();
    return ;
}