设计模式-工厂模式（Factory）（创建型模式）

以下代码来源： 设计模式精解－GoF 23种设计模式解析附C++实现源码

//Product.h

#pragma once
class Product {
public:
    virtual ~Product() = ;
protected:
    Product();
private:
};
class ConcreateProduct:public Product
{
public:
    ConcreateProduct();
    ~ConcreateProduct();
private:
protected:
};

//Product.cpp

#include"Product.h"
#include<iostream>

Product::Product()
{

}

Product::~Product()
{

}

ConcreateProduct::ConcreateProduct()
{
    std::cout << "ConcreateProduct" << std::endl;
}
ConcreateProduct::~ConcreateProduct()
{

}

//Factory.h

#pragma once
class Product;
class Factory {
public:
    virtual ~Factory() = ;
    virtual Product* CreateProduct() = ;
protected:
    Factory();
private:
};

class ConcreateFactory:public Factory {
public:
    ConcreateFactory();
    ~ConcreateFactory();
    Product* CreateProduct();
protected:
private:

};

//Factory.cpp

#include"Factory.h"
#include"Product.h"
#include<iostream>

Factory::Factory(){}
Factory::~Factory(){}
ConcreateFactory::ConcreateFactory()
{
    std::cout << "ConcreateFactory" << std::endl;
}
ConcreateFactory::~ConcreateFactory(){}
Product* ConcreateFactory::CreateProduct()
{
    return new ConcreateProduct();
}

//main.cpp

#include"Factory.h"
#include"Product.h"
#include<iostream>

int main(int args, char* argv[])
{
    Factory* fac = new ConcreateFactory();//将类的具体化延迟到了子类。
    Product* pro = fac->CreateProduct();//将类中的对象进行了封装。
    Product* pro1 = fac->CreateProduct();
    return ;
}