设计模式-创建型-工厂方法

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#pragma once#ifndef FACTORY_H #define FACTORY_H class Product { public: Product(){} virtual ~Product(){} }; class ConcreateProduct : public Product { public: ConcreateProduct(); virtual ~ConcreateProduct(); }; class Factory { public: Factory(){} virtual ~Factory(){} Product* CreateProduct(); protected: virtual Product* FactoryMethod() = 0; }; class ConcreateFactory : public Factory { public: ConcreateFactory(); virtual ~ConcreateFactory(); protected: virtual Product* FactoryMethod(); }; #endif

#include "StdAfx.h"#include "factory_impl.h"#include <iostream> using namespace std; ConcreateProduct::ConcreateProduct() { std::cout << "construction of ConcreateProduct\n"; } ConcreateProduct::~ConcreateProduct() { std::cout << "destruction of ConcreateProduct\n"; } Product* Factory::CreateProduct() { std::cout << "an operation of product\n"; Product* p = FactoryMethod(); //子类决定实例哪一个类return p;} ConcreateFactory::ConcreateFactory() { std::cout << "construction of ConcreateFactory\n"; } ConcreateFactory::~ConcreateFactory() { std::cout << "destruction of ConcreateFactory\n"; } Product* ConcreateFactory::FactoryMethod() { return new ConcreateProduct(); }

// Factory.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include <stdlib.h>#include "factory_impl.h"#include <memory>using namespace std;//定义一个用于创建对象的接口，让子类决定实例化哪一个类。Factory  Method使一个类的实例化延迟到其子类。 int _tmain(int argc, _TCHAR* argv[]){//udp_factory,tcp_factory,rtsp_factoryauto_ptr<Factory> fy(new ConcreateFactory()); auto_ptr<Product> pt(fy->CreateProduct()); //决定实例化哪一个类，使一个类的实例化延迟到其子类system("pause"); return 0;}

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