适配器模式

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适配器模式：将一个类的接口，转换成客户期望的另一个接口。适配器让原本不兼容的类可以合作无间。

类图为：

举一个例子，客户需要一只鸭子(Target)，但是手头只有一只火鸡(Adaptee)，那么这只火鸡(Adaptee)就可通过适配器(Adapter)伪装成一只鸭子(Target)供客户使用。

看代码：

adapter.h

#pragma once#include <iostream>using namespace std;//鸭子基类class Duck{public:Duck() {}virtual ~Duck() {}virtual void quack() = 0;virtual void fly() = 0;};//绿头鸭class MallardDuck : public Duck{public:MallardDuck() {}~MallardDuck() {}void quack() { cout<<"Quack"<<endl; }void fly() { cout<<"I'm flying"<<endl;}};//火鸡基类class Turkey{public:Turkey() {}virtual ~Turkey() {}virtual void gobble() = 0;virtual void fly() = 0;};//街头火鸡class WildTurkey : public Turkey{public:WildTurkey() {}~WildTurkey() {}void gobble() { cout<<"Gobble gobble"<<endl; }void fly() { cout<<"I'm flying a short distance"<<endl;}};//适配器class TurkeyAdapter : public Duck{private:Turkey *turkey;public:TurkeyAdapter(Turkey *turkey) : turkey(turkey) {}~TurkeyAdapter() {}void quack() { turkey->gobble(); }void fly() { turkey->fly(); }};

测试：

#include "adapter.h"#include <cstdlib>using namespace std;void testDuck(Duck *duck){duck->quack();duck->fly();}int main(){MallardDuck *duck = new MallardDuck();WildTurkey *turkey = new WildTurkey();Duck *turkeyAdapter = new TurkeyAdapter(turkey);cout<<"The Turkey says..."<<endl;turkey->gobble();turkey->fly();cout<<"The duck says..."<<endl;testDuck(duck);cout<<"The TurkeyAdapter says..."<<endl;testDuck(turkeyAdapter);system("pause");return 0;}

结果：

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