C++使用Bridge桥接模式 C++设计模式编程中使用Bridge桥接模式的完全攻略

#ifndef _ABSTRACTION_H_
#define _ABSTRACTION_H_

class AbstractionImplement;

class Abstraction
{
public:
  virtual void Operation()=0;//定义接口，表示该类所支持的操作
  virtual ~Abstraction();
protected:
  Abstraction();
};

class RefinedAbstractionA:public Abstraction
{
public:
  RefinedAbstractionA(AbstractionImplement* imp);//构造函数
  virtual void Operation();//实现接口
  virtual ~RefinedAbstractionA();//析构函数
private:
  AbstractionImplement* _imp;//私有成员
};

class RefinedAbstractionB:public Abstraction
{
public:
  RefinedAbstractionB(AbstractionImplement* imp);//构造函数
  virtual void Operation();//实现接口
  virtual ~RefinedAbstractionB();//析构函数
private:
  AbstractionImplement* _imp;//私有成员
};
#endif

Abstraction.cpp
#include "Abstraction.h"
#include "AbstractionImplement.h"
#include <iostream>

using namespace std;

Abstraction::Abstraction()
{}

Abstraction::~Abstraction()
{}

RefinedAbstractionA::RefinedAbstractionA(AbstractionImplement* imp)
{
  this->_imp = imp;
}

RefinedAbstractionA::~RefinedAbstractionA()
{
  delete this->_imp;
  this->_imp = NULL;
}

void RefinedAbstractionA::Operation()
{
  cout << "RefinedAbstractionA::Operation" << endl;
  this->_imp->Operation();
}

RefinedAbstractionB::RefinedAbstractionB(AbstractionImplement* imp)
{
  this->_imp = imp;
}

RefinedAbstractionB::~RefinedAbstractionB()
{
  delete this->_imp;
  this->_imp = NULL;
}

void RefinedAbstractionB::Operation()
{
  cout << "RefinedAbstractionB::Operation" << endl;
  this->_imp->Operation();
}

AbstractImplement.h
#ifndef _ABSTRACTIONIMPLEMENT_H_
#define _ABSTRACTIONIMPLEMENT_H_

//抽象基类，定义了实现的接口
class AbstractionImplement
{
public:
  virtual void Operation()=0;//定义操作接口
  virtual ~AbstractionImplement();
protected:
  AbstractionImplement();
};

// 继承自AbstractionImplement,是AbstractionImplement的不同实现之一
class ConcreteAbstractionImplementA:public AbstractionImplement
{
public:
  ConcreteAbstractionImplementA();
  void Operation();//实现操作
  ~ConcreteAbstractionImplementA();
protected:
};

// 继承自AbstractionImplement,是AbstractionImplement的不同实现之一
class ConcreteAbstractionImplementB:public AbstractionImplement
{
public:
  ConcreteAbstractionImplementB();
  void Operation();//实现操作
  ~ConcreteAbstractionImplementB();
protected:
};
#endif

AbstractImplement.cpp
#include "AbstractionImplement.h"
#include <iostream>

using namespace std;

AbstractionImplement::AbstractionImplement()
{}

AbstractionImplement::~AbstractionImplement()
{}

ConcreteAbstractionImplementA::ConcreteAbstractionImplementA()
{}

ConcreteAbstractionImplementA::~ConcreteAbstractionImplementA()
{}

void ConcreteAbstractionImplementA::Operation()
{
  cout << "ConcreteAbstractionImplementA Operation" << endl;
}

ConcreteAbstractionImplementB::ConcreteAbstractionImplementB()
{}

ConcreteAbstractionImplementB::~ConcreteAbstractionImplementB()
{}

void ConcreteAbstractionImplementB::Operation()
{
  cout << "ConcreteAbstractionImplementB Operation" << endl;
}

#include "Abstraction.h"
#include "AbstractionImplement.h"
#include <iostream>

using namespace std;

int main()
{
  /* 将抽象部分与它的实现部分分离，使得它们可以独立地变化

  1、抽象Abstraction与实现AbstractionImplement分离;

  2、抽象部分Abstraction可以变化，如new RefinedAbstractionA(imp)、new RefinedAbstractionB(imp2);

  3、实现部分AbstractionImplement也可以变化，如new ConcreteAbstractionImplementA()、new ConcreteAbstractionImplementB();

  */

  AbstractionImplement* imp = new ConcreteAbstractionImplementA();    //实现部分ConcreteAbstractionImplementA
  Abstraction* abs = new RefinedAbstractionA(imp);            //抽象部分RefinedAbstractionA
  abs->Operation();

  cout << "-----------------------------------------" << endl;

  AbstractionImplement* imp1 = new ConcreteAbstractionImplementB();    //实现部分ConcreteAbstractionImplementB
  Abstraction* abs1 = new RefinedAbstractionA(imp1);            //抽象部分RefinedAbstractionA
  abs1->Operation();

  cout << "-----------------------------------------" << endl;

  AbstractionImplement* imp2 = new ConcreteAbstractionImplementA();    //实现部分ConcreteAbstractionImplementA
  Abstraction* abs2 = new RefinedAbstractionB(imp2);            //抽象部分RefinedAbstractionB
  abs2->Operation();

  cout << "-----------------------------------------" << endl;

  AbstractionImplement* imp3 = new ConcreteAbstractionImplementB();    //实现部分ConcreteAbstractionImplementB
  Abstraction* abs3 = new RefinedAbstractionB(imp3);            //抽象部分RefinedAbstractionB
  abs3->Operation();

  cout << endl;
  return 0;
}