Implement "GOF's Adapter pattern" Using C++(Series of Gof patterns using C++ 2nd article)

Implement "GOF's Adapter pattern" Using C++(Series of Gof patterns using C++ 2nd article)

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 : [email protected].
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
17 using   namespace  std;
18
19 class  OrginSystem
20 {
21
22public:
23    void Supply()
24    {
25        cout<<"Orgin:SupplyACup"<<endl;
26    }
27} ;
28 class  CapSystem
29 {
30public:
31    void Supply()
32    {
33        cout<<"CapSystem:SupplyACap"<<endl;
34    }
35} ;
36 class  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} ;
46 int  _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
17 using   namespace  std;
18
19 class  OrginSystem
20 {
21
22public:
23    void Supply()
24    {
25        cout<<"Orgin:SupplyACup"<<endl;
26    }
27} ;
28 class  CapSystem
29 {
30public:
31    void Supply()
32    {
33        cout<<"CapSystem:SupplyACap"<<endl;
34    }
35} ;
36 class  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} ;
53 int  _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.