Adapter模式

在软件开发过程中，经常会使用第三方库。如果使用第三方库，那么我们对客户提供的接口和第三方库的接口不一致时，应该怎么解决。这是Adapter模式要解决的问题。即把一个类的接口转化为客户希望的接口。

Adatper模式的实现这里给出2种模式：类模式和对象模式。

类模式中，Adapter类继承和复用Adaptee的接口；而对象模式中，Adapter采用组合的方式来调用Adaptee中的接口。

类模式中，类的结构如下：

下面给出实现：

类模式

//Adapter.h

//Adapter.h#ifndef _ADAPTER_H_#define _ADAPTER_H_class Target{public:    Target();    virtual ~Target();    virtual void Request();};class Adaptee{public:    Adaptee();    ~Adaptee();    void SpecificRequest();};class Adapter :public Target, private Adaptee{public:    Adapter();    ~Adapter();    void Request();};#endif

//Adapter.cpp

//Adapter.cpp#include"Adapter.h"#include<iostream>Target::Target(){}Target::~Target(){}void Target::Request(){    std::cout << "Target::Request" << std::endl;}Adaptee::Adaptee(){}Adaptee::~Adaptee(){}void Adaptee::SpecificRequest(){    std::cout << "Adaptee::SpecificRequest" << std::endl;}Adapter::Adapter(){}Adapter::~Adapter(){}void Adapter::Request(){    this->SpecificRequest();}

//main.cpp

#include"Adapter.h"int main(){    Target* adt = new Adapter();    adt->Request();    return 0;}

对象模式

对象模式中，类的结构如下：

//Adapter.h

//Adapter.h#ifndef _ADAPTER2_H_#define _ADAPTER2_H_class Target{public:    Target();    virtual ~Target();    virtual void Request();};class Adaptee{public:    Adaptee();    ~Adaptee();    void SpecificRequest();};class Adapter :public Target{public:    Adapter(Adaptee* ade);    ~Adapter();    void Request();private:    Adaptee* _ade;};#endif

//Adapter.cpp

//Adapter.cpp#include"Adapter2.h"#include<iostream>Target::Target(){}Target::~Target(){}void Target::Request(){    std::cout << "Target::Request" << std::endl;}Adaptee::Adaptee(){}Adaptee::~Adaptee(){}void Adaptee::SpecificRequest(){    std::cout << "Adaptee::SpecificRequest" << std::endl;}Adapter::Adapter(Adaptee* ade){    _ade = ade;}Adapter::~Adapter(){}void Adapter::Request(){    _ade->SpecificRequest();}

//main.cpp

#include"Adapter2.h"int main(){    Target* adt = new Adapter(new Adaptee());    adt->Request();    return 0;}