Builder Pattern（建造者模式）

/*Product.h*/
#ifndef PRODUCT_H
#define PRODUCT_H

class Product
{
public:
    Product();
    ~Product();
protected:
private:
};
#endif

/*Product.cpp*/
#include "Product.h"

Product::Product()
{
}

Product::~Product()
{
}

/*Builder.h*/
#ifndef BUILDER_H
#define BUILDER_H
#include <string>

class Product
{
public:
    virtual ~Builder();
    virtual void BuildPartA(const string &build_para)=0;
    virtual void BuildPartB(const string &build_para)=0;
    virtual void BuildPartC(const string &build_para)=0;
    virtual Product *GetProduct()=0;
protected:
    Builder();
private:
};

class ConcreteBuilder:public Builder
{
public:
    ConcreteBuilder();
    ~ConcreteBuilder();
    void BuilderPartA(const string &build_para);
    void BuilderPartB(const string &build_para);
    void BuilderPartC(const string &build_para);
    Product *GetProduct();
};
#endif

/*Builder.cpp*/
#include "Builder.h"
#include "Product.h"
#include <iostream>

Builder::Builder()
{
}

Builder::~Builder()
{
}

ConcreteBuilder::ConcreteBuilder()
{
}

ConcreteBuilder::~ConcreteBuilder()
{
}

ConcreteBuilder::BuildPartA(const string &build_para)
{
    std::cout<<"build_para"<<std::endl;
}

ConcreteBuilder::BuildPartB(const string &build_para)
{
    std::cout<<"build_para"<<std::endl;
}

ConcreteBuilder::BuildPartC(const string &build_para)
{
    std::cout<<"build_para"<<std::endl;
}

ConcreteBuilder *ConcreteBuilder::GetProduct()
{
    BuildPartA("Defined");
    BuildPartB("Defined");
    BuildPartC("Defined");
    return new Product();
}

/*Director.h*/
#ifndef DIRECTOR_H
#define DIRECTOR_H

class Builder
class Director
{
public:
    Director(Builder *bld);
    ~Director();
    void Construct();
protected:
private:
    Builder *bld_;
};
#endif

/*Director.cpp*/
#include "Diretor.h"
#include "Builder.h"

Director::Director(Builder *bld)
{
    bld_=bld;
}

Director::~Director()
{
}

void Director::Construct()
{
    bld_->BuildPartA("Defined");
    bld_->BuildPartB("Defined");
    bld_->BuildPartC("Defined");
}

/*main.cpp*/
#include <iostream>
#include "Product.h"
#include "Builder.h"
#include "Director.h"

int main()
{
    Director *d=new Director(new ConcreteBuilder());
    d->Construct();
    return 0;
}