C++设计模式之建造者模式

 
#include <iostream>
#include <vector>
using namespace std;
 
class Builder;
 
// Product
class Product
{
public:
    void AddPart(const char *info) { m_PartInfoVec.push_back(info); }
    void ShowProduct()
    {
        for (std::vector<const char *>::iterator item = m_PartInfoVec.begin(); 
            item != m_PartInfoVec.end(); ++item)
        {
            cout<<*item<<endl;
        }
    }
 
private:
    std::vector<const char *> m_PartInfoVec;
};
 
// Builder
class Builder
{
public:
    virtual void BuildPartA() {}
    virtual void BuildPartB() {}
    virtual Product *GetProduct() { return NULL; }
};
 
// ConcreteBuilder
class ConcreteBuilder : public Builder
{
public:
    ConcreteBuilder() { m_Product = new Product(); }
    void BuildPartA()
    {
        m_Product->AddPart("PartA completed");
    }
 
    void BuildPartB()
    {
        m_Product->AddPart("PartB completed");
    }
 
    Product *GetProduct() { return m_Product; }
 
private:
    Product *m_Product;
};
 
// Director
class Director
{
public:
    Director(Builder *builder) { m_Builder = builder; }
    void CreateProduct()
    {
        m_Builder->BuildPartA();
        m_Builder->BuildPartB();
    }
 
private:
    Builder *m_Builder;
};
 
// main
int main()
{
    Builder *builderObj = new ConcreteBuilder();
    Director directorObj(builderObj);
    directorObj.CreateProduct();
    Product *productObj = builderObj->GetProduct();
    if (productObj == NULL)
    {
        return 0;
    }