设计模式6：建造者模式【创建型】

#include <iostream>
#include <vector>
using namespace std;

//
class CProduct
{
public:
CProduct() { }

void Add(char *str) { m_pVec.push_back(str); }

void ShowProduct()
{
vector<char*>::iterator ite = m_pVec.begin();
for (; m_pVec.end() != ite; ite++)
{
cout<<*ite<<endl;
}
}
private:
vector<char*> m_pVec;
};
//
struct IBuilder
{
public:
IBuilder() { m_pProduct = new CProduct; }
virtual ~IBuilder()
{
if(m_pProduct)
{
delete m_pProduct;
m_pProduct = NULL;
}
}

virtual void BuildStep1() = 0;
virtual void BuildStep2() = 0;
virtual void BuildStep3() = 0;

CProduct* GetProduct() { return m_pProduct; }

protected:
CProduct *m_pProduct;
};

class CBuilderA : public IBuilder
{
public:
virtual ~CBuilderA() { }

virtual void BuildStep1() { m_pProduct->Add("A Step 1"); }
virtual void BuildStep2() { m_pProduct->Add("A Step 2");  }
virtual void BuildStep3() { m_pProduct->Add("A Step 3");  }
};

class CBuilderB : public IBuilder
{
public:
virtual ~CBuilderB() { }

virtual void BuildStep1() { m_pProduct->Add("B Step 1"); }
virtual void BuildStep2() { m_pProduct->Add("B Step 2");  }
virtual void BuildStep3() { m_pProduct->Add("B Step 3");  }
};

//
class CDirector
{
public:
CDirector() { }
~CDirector() { }

void Produce(IBuilder *pBuilder)
{
pBuilder->BuildStep1();
pBuilder->BuildStep2();
pBuilder->BuildStep3();
}
};

//
void main()
{
CDirector director;

//
CBuilderA builderA;
director.Produce(&builderA);

CProduct *pProductA = builderA.GetProduct();
pProductA->ShowProduct();

//
CBuilderB builderB;
director.Produce(&builderB);

CProduct *pProductB = builderB.GetProduct();
pProductB->ShowProduct();
}