作用：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.

UML结构图:


讯享网 

Bridge的实现方式其实和Builde十分的相近,可以这么说:本质上是一样的,只是封装的东西不一样罢了.两者的实现都有如下的共同点:抽象出来一个基类,这个基类里面定义了共有的一些行为,形成接口函数(对接口编程而不是对实现编程),这个接口函数在Buildier中是BuildePart函数在Bridge中是OperationImpl函数;其次,聚合一个基类的指针,如Builder模式中Director类聚合了一个Builder基类的指针,而Brige模式中Abstraction类聚合了一个Implementor基类的指针(优先采用聚合而不是继承);而在使用的时候,都把对这个类的使用封装在一个函数中,在Bridge中是封装在Director::Construct函数中,因为装配不同部分的过程是一致的,而在Bridge模式中则是封装在Abstraction::Operation函数中,在这个函数中调用对应的Implementor::OperationImpl函数.就两个模式而言,Builder封装了不同的生成组成部分的方式,而Bridge封装了不同的实现方式.

abstraction.h

#ifndef ABSTRACTION_H_ #define ABSTRACTION_H_ #include "AbstractionImp.h" class AbstractionImp; class Abstraction { public: virtual ~Abstraction(); virtual void Operation()=0; protected: Abstraction(); private: }; class RefinedAbstration:public Abstraction { public: RefinedAbstration(AbstractionImp* imp); virtual ~RefinedAbstration(); virtual void Operation(); protected: private: AbstractionImp* m_imp; }; #endif 

abstraction.cpp

#include "abstraction.h" #include<iostream> Abstraction::Abstraction() { using std::cout; using std::endl; cout<<"construction Abstraction"<<endl; } Abstraction::~Abstraction() { using std::cout; using std::endl; cout<<"deconstruction Abstraction"<<endl; } RefinedAbstration::RefinedAbstration(AbstractionImp* imp) { this->m_imp=imp; } RefinedAbstration::~RefinedAbstration() { using std::cout; using std::endl; // delete m_imp; cout<<"deconstruction RefinedAbstraction"<<endl; } void RefinedAbstration::Operation() { m_imp->Operation(); }  

abstractionImp.h 

#ifndef ABSTRACTIONIMP_H_ #define ABSTRACTIONIMP_H_ class AbstractionImp { protected: AbstractionImp(); public: virtual ~AbstractionImp(); virtual void Operation()=0; private: }; class ConcreteAbstractionImp1:public AbstractionImp { public: ConcreteAbstractionImp1(); virtual ~ConcreteAbstractionImp1(); virtual void Operation(); }; class ConcreteAbstractionImp2:public AbstractionImp { public: ConcreteAbstractionImp2(); virtual ~ConcreteAbstractionImp2(); virtual void Operation(); }; #endif

abstractionImp.cpp

#include "AbstractionImp.h" #include <iostream> AbstractionImp::AbstractionImp() { using std::cout; using std::endl; cout<<"construction AbstractionImp"<<endl; } AbstractionImp::~AbstractionImp() { using std::cout; using std::endl; cout<<"deconstruction AbstractionImp"<<endl; } ConcreteAbstractionImp2::ConcreteAbstractionImp2() { using std::cout; using std::endl; cout<<"construction ConcreteAbstractionImp2"<<endl; } ConcreteAbstractionImp2::~ConcreteAbstractionImp2() { using std::cout; using std::endl; cout<<"deconstruction ConcreteAbstractionImp2"<<endl; } void ConcreteAbstractionImp2::Operation() { using std::cout; using std::endl; cout<<"concreteAbstractionImp2 operation"<<endl; } ConcreteAbstractionImp1::ConcreteAbstractionImp1() { using std::cout; using std::endl; cout<<"construction concreteAbstractionImp1"<<endl; } ConcreteAbstractionImp1::~ConcreteAbstractionImp1() { using std::cout; using std::endl; cout<<"deconstruction concreateAbstractionImp1"<<endl; } void ConcreteAbstractionImp1::Operation() { using std::cout; using std::endl; cout<<"ConcreteAbstractionImp1 operation"<<endl; }

main.cpp

#include "AbstractionImp.h" #include <iostream> AbstractionImp::AbstractionImp() { using std::cout; using std::endl; cout<<"construction AbstractionImp"<<endl; } AbstractionImp::~AbstractionImp() { using std::cout; using std::endl; cout<<"deconstruction AbstractionImp"<<endl; } ConcreteAbstractionImp2::ConcreteAbstractionImp2() { using std::cout; using std::endl; cout<<"construction ConcreteAbstractionImp2"<<endl; } ConcreteAbstractionImp2::~ConcreteAbstractionImp2() { using std::cout; using std::endl; cout<<"deconstruction ConcreteAbstractionImp2"<<endl; } void ConcreteAbstractionImp2::Operation() { using std::cout; using std::endl; cout<<"concreteAbstractionImp2 operation"<<endl; } ConcreteAbstractionImp1::ConcreteAbstractionImp1() { using std::cout; using std::endl; cout<<"construction concreteAbstractionImp1"<<endl; } ConcreteAbstractionImp1::~ConcreteAbstractionImp1() { using std::cout; using std::endl; cout<<"deconstruction concreateAbstractionImp1"<<endl; } void ConcreteAbstractionImp1::Operation() { using std::cout; using std::endl; cout<<"ConcreteAbstractionImp1 operation"<<endl; }