说明:《Head First设计模式》第七章Adapter模式C++实现，用火鸡来模仿鸭子。
鸭子类Duck.h：
#pragma once
#include <iostream>
using namespace std;
//鸭子
class IDuck
{
public:
virtual ~IDuck(){}
//呱呱叫
virtual void Quack() = 0;
//飞行
virtual void Fly() = 0;
};
//绿头鸭
class CMallardDuck : public IDuck
{
public:
void Quack()
{
cout<<"Quack"<<endl;
}
void Fly()
{
cout<<"I'm flying"<<endl;
}
};
火鸡类Turkey.h：
#pragma once
#include <iostream>
using namespace std;
//火鸡
class ITurkey
{
public:
virtual ~ITurkey(){}
//咕咕叫
virtual void Gobble() = 0;
//飞行
virtual void Fly() = 0;
};
class CWildTurkey : public ITurkey
{
public:
void Gobble()
{
cout<<"Gobble gobble"<<endl;
}
void Fly()
{
cout<<"I'm flying a short distance"<<endl;
}
};
适配器类TurkeyAdapter.h：
#pragma once
#include "Duck.h"
#include "Turkey.h"
//用火鸡模仿鸭子
class CTurkeyAdapter : public IDuck
{
public:
CTurkeyAdapter(ITurkey* pTurkey)
: m_pTurkey(pTurkey)
{
}
void Quack()
{
m_pTurkey->Gobble();
}
void Fly()
{
//火鸡飞行距离短，飞行五次模拟鸭子
for (int i = 0; i < 5; i++)
{
m_pTurkey->Fly();
}
}
private:
ITurkey* m_pTurkey;
};
调用方法：
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
int nRetCode = 0;
// initialize MFC and print and error on failure
if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: MFC initialization failed\n"));
return 1;
}
//创建鸭子
IDuck* pDuck = new CMallardDuck();
//创建火鸡
ITurkey* pTurkey = new CWildTurkey();
//创建火鸡适配器
IDuck* pAdapter = new CTurkeyAdapter(pTurkey);
cout<<"The Turkey says..."<<endl;
pTurkey->Gobble();
pTurkey->Fly();
cout<<"\nThe Duck says..."<<endl;
pDuck->Quack();
pDuck->Fly();
cout<<"\nThe TurkeyAdapter says..."<<endl;
pAdapter->Quack();
pAdapter->Fly();
delete pAdapter;
pAdapter = NULL;
delete pTurkey;
pTurkey = NULL;
delete pDuck;
pDuck = NULL;
return nRetCode;
}
