工厂方法模式 C++实现

//
//  main.cpp
//  factory_method_pattern
//
//  Created by apple on 2019/3/10.
//  Copyright © 2019年 apple. All rights reserved.
//

#include <iostream>

class IProduct
{
public:
    virtual void create() = 0;
    virtual ~IProduct() {}
};

class Error:public IProduct
{
public:
    void create()
    {
        std::cout<<"Error"<<std::endl;
    }
};
class Box:public IProduct
{
public:
    void create()
    {
        std::cout<<"Box"<<std::endl;
    }
};
class Phone:public IProduct
{
public:
    void create()
    {
        std::cout<<"Phone"<<std::endl;
    }
};
class Pen:public IProduct
{
public:
    void create()
    {
        std::cout<<"Pen"<<std::endl;
    }
};
class IFactory
{
public:
    virtual IProduct *GetProduct() = 0;
    virtual ~IFactory() {}
};
class FactoryA:public IFactory
{
public:
    IProduct *GetProduct();
};
class FactoryB:public IFactory
{
public:
    IProduct *GetProduct();
};

IProduct *FactoryA::GetProduct()
{
    return new Box();//A工厂只能生产Box
}
IProduct *FactoryB::GetProduct()
{
    return new Phone();//B工厂只能生产Phone
}


int main(int argc, const char * argv[]) {
    IProduct *product;
    IFactory *factory;
    
    factory= new FactoryA();
    product = factory->GetProduct();
    product->create();
    delete product;
    product = NULL;
    delete factory;
    factory = NULL;
    
    factory = new FactoryB();
    product = factory->GetProduct();
    product->create();
    delete product;
    product = NULL;
    
    delete factory;
    factory = NULL;
    return 0;
}

Box
Phone
Program ended with exit code: 0