标签：string void virtual 模式 ........ PlaySound public
在软件组织中，责任划分不明确，使得继承会使得子类随着需求变化而急剧膨胀
以下这种消息的基类进行扩展，出现pc和mobile并出现了lite和prefect版本其中的功能（方法）实现代码大量重复
将基类分成两部分抽象部分（业务功能）和实现部分（平台实现）
bridge1.cpp
class Messager{
public:
virtual void Login(string username, string password)=0;
virtual void SendMessage(string message)=0;
virtual void SendPicture(Image image)=0;
virtual void PlaySound()=0;
virtual void DrawShape()=0;
virtual void WriteText()=0;
virtual void Connect()=0;
virtual ~Messager(){}
};
//平台实现
class PCMessagerBase : public Messager{
public:
virtual void PlaySound(){
//**********
}
virtual void DrawShape(){
//**********
}
virtual void WriteText(){
//**********
}
virtual void Connect(){
//**********
}
};
class MobileMessagerBase : public Messager{
public:
virtual void PlaySound(){
//==========
}
virtual void DrawShape(){
//==========
}
virtual void WriteText(){
//==========
}
virtual void Connect(){
//==========
}
};
//业务抽象
class PCMessagerLite : public PCMessagerBase {
public:
virtual void Login(string username, string password){
PCMessagerBase::Connect();
//........
}
virtual void SendMessage(string message){
PCMessagerBase::WriteText();
//........
}
virtual void SendPicture(Image image){
PCMessagerBase::DrawShape();
//........
}
};
class PCMessagerPerfect : public PCMessagerBase {
public:
virtual void Login(string username, string password){
PCMessagerBase::PlaySound();
//********
PCMessagerBase::Connect();
//........
}
virtual void SendMessage(string message){
PCMessagerBase::PlaySound();
//********
PCMessagerBase::WriteText();
//........
}
virtual void SendPicture(Image image){
PCMessagerBase::PlaySound();
//********
PCMessagerBase::DrawShape();
//........
}
};
class MobileMessagerLite : public MobileMessagerBase {
public:
virtual void Login(string username, string password){
MobileMessagerBase::Connect();
//........
}
virtual void SendMessage(string message){
MobileMessagerBase::WriteText();
//........
}
virtual void SendPicture(Image image){
MobileMessagerBase::DrawShape();
//........
}
};
class MobileMessagerPerfect : public MobileMessagerBase {
public:
virtual void Login(string username, string password){
MobileMessagerBase::PlaySound();
//********
MobileMessagerBase::Connect();
//........
}
virtual void SendMessage(string message){
MobileMessagerBase::PlaySound();
//********
MobileMessagerBase::WriteText();
//........
}
virtual void SendPicture(Image image){
MobileMessagerBase::PlaySound();
//********
MobileMessagerBase::DrawShape();
//........
}
};
void Process(){
//编译时装配
Messager *m =
new MobileMessagerPerfect();
}
bridge2.cpp
1 class Messager{
2 protected:
3 MessagerImp* messagerImp;//...
4 public:
5 virtual void Login(string username, string password)=0;
6 virtual void SendMessage(string message)=0;
7 virtual void SendPicture(Image image)=0;
8
9 virtual ~Messager(){}
10 };
11
12 class MessagerImp{
13 public:
14 virtual void PlaySound()=0;
15 virtual void DrawShape()=0;
16 virtual void WriteText()=0;
17 virtual void Connect()=0;
18
19 virtual MessagerImp(){}
20 };
21
22
23 //平台实现 n
24 class PCMessagerImp : public MessagerImp{
25 public:
26
27 virtual void PlaySound(){
28 //**********
29 }
30 virtual void DrawShape(){
31 //**********
32 }
33 virtual void WriteText(){
34 //**********
35 }
36 virtual void Connect(){
37 //**********
38 }
39 };
40
41 class MobileMessagerImp : public MessagerImp{
42 public:
43
44 virtual void PlaySound(){
45 //==========
46 }
47 virtual void DrawShape(){
48 //==========
49 }
50 virtual void WriteText(){
51 //==========
52 }
53 virtual void Connect(){
54 //==========
55 }
56 };
57
58
59
60 //业务抽象 m
61
62 //类的数目：1+n+m
63
64 class MessagerLite :public Messager {
65
66
67 public:
68
69 virtual void Login(string username, string password){
70
71 messagerImp->Connect();
72 //........
73 }
74 virtual void SendMessage(string message){
75
76 messagerImp->WriteText();
77 //........
78 }
79 virtual void SendPicture(Image image){
80
81 messagerImp->DrawShape();
82 //........
83 }
84 };
85
86
87
88 class MessagerPerfect :public Messager {
89
90
91 public:
92
93 virtual void Login(string username, string password){
94
95 messagerImp->PlaySound();
96 //********
97 messagerImp->Connect();
98 //........
99 }
100 virtual void SendMessage(string message){
101
102 messagerImp->PlaySound();
103 //********
104 messagerImp->WriteText();
105 //........
106 }
107 virtual void SendPicture(Image image){
108
109 messagerImp->PlaySound();
110 //********
111 messagerImp->DrawShape();
112 //........
113 }
114 };
115
116
117
118
119 void Process(){
120 //运行时装配
121 MessagerImp* mImp=new PCMessagerImp();
122 Messager *m =new Messager(mImp);
123 }
标签：string,void,virtual,模式,........,PlaySound,public 来源： https://www.cnblogs.com/miaorn/p/14396842.html
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