设计模式（三）之建造者模式（Builder） C++实现

作用:

将一个复杂对象的构建与它的表示分离，使得同样的构建过程可以创建不同的表示。

解析:

Builder模式是基于这样的一个情况：一个对象可能有不同的组成部分，这几个部分的不同的创建对象会有不同的表示，但是各个部分之间装配的方式是一致的。

Builder.h

// 抽象基类AbstractProductA,代表产品A的抽象class Builder{public:    Builder(){}    virtual ~Builder(){}    virtual void BuildPartA() = 0;    virtual void BuildPartB() = 0;};class ConcreateBuilder1    : public Builder{public:    ConcreateBuilder1(){}    virtual ~ConcreateBuilder1(){}    virtual void BuildPartA();    virtual void BuildPartB();};class ConcreateBuilder2    : public Builder{public:    ConcreateBuilder2(){}    virtual ~ConcreateBuilder2(){}    virtual void BuildPartA();    virtual void BuildPartB();};class Director{public:    Director(Builder * pBuilder) : m_pBuilder(pBuilder){}    ~Director();    void Construct();private:    Builder * m_pBuilder;};

Builder.cpp

#include "Builder.h"#include <iostream>using namespace std;void ConcreateBuilder1::BuildPartA(){    cout << "ConcreateBuilder1 Step1:Build PartA..." << endl;}void ConcreateBuilder1::BuildPartB(){    cout << "ConcreateBuilder1 Step2:Build PartB..." << endl;}void ConcreateBuilder2::BuildPartA(){    cout << "ConcreateBuilder2 Step1:Build PartA..." << endl;}void ConcreateBuilder2::BuildPartB(){    cout << "ConcreateBuilder2 Step2:Build PartB..." << endl;}Director::~Director(){    delete m_pBuilder;    m_pBuilder = NULL;}void Director::Construct(){    m_pBuilder->BuildPartA();    m_pBuilder->BuildPartB();}

main.cpp

#include "AbstractFactory.h"int main(int argc, char* argv[]){    Builder *builder1 = new ConcreateBuilder1();    Builder *builder2 = new ConcreateBuilder2();    Director *director = new Director(builder1);    director->Construct();    delete director;    director = new Director(builder2);    director->Construct();    delete director;    return 0;}