設計模式——橋接模式（C++實現）

  1 [root@ ~/learn_code/design_pattern/18_bridge]$ cat Abstraction.h
  2 #ifndef _ABSTRACTION_H_
  3 #define _ABSTRACTION_H_
  4 
  5 class AbstractionImplement;
  6 
  7 class Abstraction
  8 {
  9 public:
 10     virtual void Operation()=0;//定義介面，表示該類所支持的操作
 11     virtual ~Abstraction();
 12 protected:
 13     Abstraction();
 14 };
 15 
 16 class RefinedAbstractionA:public Abstraction
 17 {
 18 public:
 19     RefinedAbstractionA(AbstractionImplement* imp);//構造函數
 20     virtual void Operation();//實現介面
 21     virtual ~RefinedAbstractionA();//析構函數
 22 private:
 23     AbstractionImplement* _imp;//私有成員
 24 };
 25 
 26 class RefinedAbstractionB:public Abstraction
 27 {
 28 public:
 29     RefinedAbstractionB(AbstractionImplement* imp);//構造函數
 30     virtual void Operation();//實現介面
 31     virtual ~RefinedAbstractionB();//析構函數
 32 private:
 33     AbstractionImplement* _imp;//私有成員
 34 };
 35 #endif
 36 
 37 
 38 [root@ ~/learn_code/design_pattern/18_bridge]$ cat Abstraction.cpp
 39 #include "Abstraction.h"
 40 #include "AbstractionImplement.h"
 41 #include <iostream>
 42 
 43 using namespace std;
 44 
 45 Abstraction::Abstraction()
 46 {}
 47 
 48 Abstraction::~Abstraction()
 49 {}
 50 
 51 RefinedAbstractionA::RefinedAbstractionA(AbstractionImplement* imp)
 52 {
 53     this->_imp = imp;
 54 }
 55 
 56 RefinedAbstractionA::~RefinedAbstractionA()
 57 {
 58     delete this->_imp;
 59     this->_imp = NULL;
 60 }
 61 
 62 void RefinedAbstractionA::Operation()
 63 {
 64     cout << "RefinedAbstractionA::Operation" << endl;
 65     this->_imp->Operation();
 66 }
 67 
 68 RefinedAbstractionB::RefinedAbstractionB(AbstractionImplement* imp)
 69 {
 70     this->_imp = imp;
 71 }
 72 
 73 RefinedAbstractionB::~RefinedAbstractionB()
 74 {
 75     delete this->_imp;
 76     this->_imp = NULL;
 77 }
 78 
 79 void RefinedAbstractionB::Operation()
 80 {
 81     cout << "RefinedAbstractionB::Operation" << endl;
 82     this->_imp->Operation();
 83 }
 84 
 85 
 86 [root@ ~/learn_code/design_pattern/18_bridge]$ cat AbstractionImplement.h
 87 #ifndef _ABSTRACTIONIMPLEMENT_H_
 88 #define _ABSTRACTIONIMPLEMENT_H_
 89 
 90 //抽象基類，定義了實現的介面
 91 class AbstractionImplement
 92 {
 93 public:
 94     virtual void Operation()=0;//定義操作介面
 95     virtual ~AbstractionImplement();
 96 protected:
 97     AbstractionImplement();
 98 };
 99 
100 // 繼承自AbstractionImplement,是AbstractionImplement的不同實現之一
101 class ConcreteAbstractionImplementA:public AbstractionImplement
102 {
103 public:
104     ConcreteAbstractionImplementA();
105     void Operation();//實現操作
106     ~ConcreteAbstractionImplementA();
107 protected:
108 };
109 
110 // 繼承自AbstractionImplement,是AbstractionImplement的不同實現之一
111 class ConcreteAbstractionImplementB:public AbstractionImplement
112 {
113 public:
114     ConcreteAbstractionImplementB();
115     void Operation();//實現操作
116     ~ConcreteAbstractionImplementB();
117 protected:
118 };
119 #endif
120 
121 
122 [root@ ~/learn_code/design_pattern/18_bridge]$ cat AbstractionImplement.cpp
123 #include "AbstractionImplement.h"
124 #include <iostream>
125 
126 using namespace std;
127 
128 AbstractionImplement::AbstractionImplement()
129 {}
130 
131 AbstractionImplement::~AbstractionImplement()
132 {}
133 
134 ConcreteAbstractionImplementA::ConcreteAbstractionImplementA()
135 {}
136 
137 ConcreteAbstractionImplementA::~ConcreteAbstractionImplementA()
138 {}
139 
140 void ConcreteAbstractionImplementA::Operation()
141 {
142     cout << "ConcreteAbstractionImplementA Operation" << endl;
143 }
144 
145 ConcreteAbstractionImplementB::ConcreteAbstractionImplementB()
146 {}
147 
148 ConcreteAbstractionImplementB::~ConcreteAbstractionImplementB()
149 {}
150 
151 void ConcreteAbstractionImplementB::Operation()
152 {
153     cout << "ConcreteAbstractionImplementB Operation" << endl;
154 }
155 
156 
157 [root@ ~/learn_code/design_pattern/18_bridge]$ cat main.cpp
158 #include "Abstraction.h"
159 #include "AbstractionImplement.h"
160 #include <iostream>
161 
162 using namespace std;
163 
164 int main()
165 {
166     /* 將抽象部分與它的實現部分分離，使得它們可以獨立地變化
167 
168     1、抽象Abstraction與實現AbstractionImplement分離;
169 
170     2、抽象部分Abstraction可以變化，如new RefinedAbstractionA(imp)、new RefinedAbstractionB(imp2);
171 
172     3、實現部分AbstractionImplement也可以變化，如new ConcreteAbstractionImplementA()、new ConcreteAbstractionImplementB();
173 
174     */
175 
176     AbstractionImplement* imp = new ConcreteAbstractionImplementA();        //實現部分ConcreteAbstractionImplementA
177     Abstraction* abs = new RefinedAbstractionA(imp);                        //抽象部分RefinedAbstractionA
178     abs->Operation();
179 
180     cout << "-----------------------------------------" << endl;
181 
182     AbstractionImplement* imp1 = new ConcreteAbstractionImplementB();        //實現部分ConcreteAbstractionImplementB
183     Abstraction* abs1 = new RefinedAbstractionA(imp1);                        //抽象部分RefinedAbstractionA
184     abs1->Operation();
185 
186     cout << "-----------------------------------------" << endl;
187 
188     AbstractionImplement* imp2 = new ConcreteAbstractionImplementA();        //實現部分ConcreteAbstractionImplementA
189     Abstraction* abs2 = new RefinedAbstractionB(imp2);                        //抽象部分RefinedAbstractionB
190     abs2->Operation();
191 
192     cout << "-----------------------------------------" << endl;
193 
194     AbstractionImplement* imp3 = new ConcreteAbstractionImplementB();        //實現部分ConcreteAbstractionImplementB
195     Abstraction* abs3 = new RefinedAbstractionB(imp3);                        //抽象部分RefinedAbstractionB
196     abs3->Operation();
197 
198     cout << endl;
199     return 0;
200 }

參考：

　　http://www.cnblogs.com/jiese/p/3164940.html

      http://design-patterns.readthedocs.io/zh_CN/latest/structural_patterns/bridge.html