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The Gof has 23 design patterns , but in most of  the design books , the E.G is written in Java , So  from now on , I will write about 23 articles to implement them using C++ , the design pattern itself is discussible , so welcome everyone to give his excelent idea to me , My QQ: 286259397 And My MSN : cxl82116@msn.com.
Welcome every one to express his ideas!

 


This is the Second Arcticle: ADAPTER PATTERN

While
referring to Adapter pattern , there must be a class that play the role of a adapter which can make two or more umcompatible class compatible . To explain this world , the UML diagram can make it clear easily :


        diagram 2-1 Class Adapter UML (referred from http://terrylee.cnblogs.com)


        diagram 2-2  Object Adapter UML (referred from http://terrylee.cnblogs.com)


E.G Explain them sparetely:
if a Customer request a  CUP WITH A CAP , but the orgin system can only supply a CUP , So you it's not compatible between the Request and the Orgin System , so you must find anthor factory who supply the cap ,and make it together to statisfy the customer ,  implement it in Class Adapter Pattern , Codes goes below.
Class Adapter Pattern:

 1/********************************************************************
 2    created:    2007/04/21
 3    created:    21:4:2007   18:47
 4    filename:     c:\Visual Studio 2005\Projects\Frist2005\Frist2005\Frist2005.cpp
 5    file path:    c:\Visual Studio 2005\Projects\Frist2005\Frist2005
 6    file base:    Frist2005
 7    file ext:    cpp
 8    author:        Chang Xinglong(King.C)
 9    
10    purpose:    Adapter Pattern -Class
11*********************************************************************/

12
13#include "stdafx.h"
14#include <map>
15#include <iostream>
16
17using namespace std;
18
19class OrginSystem
20{
21
22public:
23    void Supply()
24    {
25        cout<<"Orgin:SupplyACup"<<endl;
26    }

27}
;
28class CapSystem
29{
30public:
31    void Supply()
32    {
33        cout<<"CapSystem:SupplyACap"<<endl;
34    }

35}
;
36class Adapter: public OrginSystem , CapSystem
37{
38public:
39    void Supply()
40    {
41        OrginSystem::Supply();
42        CapSystem::Supply();
43        cout<<"So the request has been satisfied!"<<endl;
44    }

45}
;
46int _tmain(int argc, _TCHAR* argv[])
47{
48    Adapter _adpter;
49    _adpter.Supply();
50    system("pause");
51    return 0;
52}

The Same question , implement it using Object Adapter Pattern:
 1/********************************************************************
 2    created:    2007/04/21
 3    created:    21:4:2007   18:47
 4    filename:     c:\Visual Studio 2005\Projects\Frist2005\Frist2005\Frist2005.cpp
 5    file path:    c:\Visual Studio 2005\Projects\Frist2005\Frist2005
 6    file base:    Frist2005
 7    file ext:    cpp
 8    author:        Chang Xinglong(King.C)
 9    
10    purpose:    Adapter Pattern-Object 
11*********************************************************************/

12
13#include "stdafx.h"
14#include <map>
15#include <iostream>
16
17using namespace std;
18
19class OrginSystem
20{
21
22public:
23    void Supply()
24    {
25        cout<<"Orgin:SupplyACup"<<endl;
26    }

27}
;
28class CapSystem
29{
30public:
31    void Supply()
32    {
33        cout<<"CapSystem:SupplyACap"<<endl;
34    }

35}
;
36class Adapter: public OrginSystem , CapSystem
37{
38public:
39    Adapter():_os(new OrginSystem),_cs(new CapSystem)
40    {
41
42    }

43    void Supply()
44    {
45        _os->Supply();
46        _cs->Supply();
47        cout<<"So the request has been satisfied!"<<endl;
48    }

49private:
50    OrginSystem *_os;
51    CapSystem * _cs;
52}
;
53int _tmain(int argc, _TCHAR* argv[])
54{
55    OrginSystem _orign=new _adpter();
56    _orign.Supply();
57    system("pause");
58    return 0;
59}

60
61

In C++ , Muiltple-Derived pattern is not a recommend pattern, So if possible , use the Obeject -Adpter Pattern.

That's all ,Thanks! if any different idea , send me E-mail.
posted on 2007-04-21 19:13 常兴龙 阅读(1371) 评论(4)  编辑 收藏 引用 所属分类: Design Patterns & Engeering

评论

# re: Implement "GOF's Adapter pattern" Using C++(Series of Gof patterns using C++ 2nd article) 2007-04-22 13:23 kurt
I think the UML is enough for us to understand it  回复  更多评论
  

# re: Implement "GOF's Adapter pattern" Using C++(Series of Gof patterns using C++ 2nd article) 2007-04-22 14:47 天津大学计算机学院 常兴龙
hehe ,thanks for your comment , it's just for the beginner study c++ systemly and this article can demostrate that how to implement interface( in Java , there is the Keyword interface) using virtual function in C++ , the uml itself didn't express this. Thanks again!  回复  更多评论
  

# re: Implement "GOF's Adapter pattern" Using C++(Series of Gof patterns using C++ 2nd article) 2007-04-22 21:27 ★田德健★
all are english....  回复  更多评论
  

# re: Implement "GOF's Adapter pattern" Using C++(Series of Gof patterns using C++ 2nd article) 2007-09-12 15:47 Andrew Selivanov
I suppose this would be more compatible version (see below)
----------------------------------------------------------
#include <iostream>

#define USE_ADAPTER
#ifndef USE_ADAPTER

class OrginSystem
{

public:
void Supply()
{
std::cout<<"Orgin:SupplyACup"<<std::endl;
}
};
class CapSystem
{
public:
void Supply()
{
std::cout<<"CapSystem:SupplyACap"<<std::endl;
}
};
class Adapter: public OrginSystem , CapSystem
{
public:
void Supply()
{
OrginSystem::Supply();
CapSystem::Supply();
std::cout<<"So the request has been satisfied!"<<std::endl;
}
};

int main()
{
Adapter adapter;
adapter.Supply();
}
#else

class OrginalSystem
{

public:

virtual void Supply()
{
std::cout<<"Orgin:SupplyACup"<<std::endl;
}
};
class CapSystem
{
public:
virtual void Supply()
{
std::cout<<"CapSystem:SupplyACap"<<std::endl;
}
};
class Adapter: public OrginalSystem , CapSystem
{
OrginalSystem* _os;
CapSystem* _cs;

public:
Adapter():_os(new OrginalSystem),_cs(new CapSystem)
{

}
void Supply()
{
_os->Supply();
_cs->Supply();
std::cout<<"So the request has been satisfied!"<<std::endl;
}
};

int main()
{
OrginalSystem* original = new Adapter();
original->Supply();
delete original;
}

#endif
----------------------------------------------------------
Andrew  回复  更多评论
  


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