设计模式之简单工厂+普通工厂+抽象工厂C++实现

这破设计模式不自己写一下，看书真是感觉像天书。自己写一下，是TM真简单。。

简单工厂：

#include<iostream>
using namespace std;

//产品类（抽象类，不能实例化）
class Product{
public:
    Product(){}
    virtual void show()=0;  //纯虚函数
};


//产品1
class Product_A:public Product{
public:
    Product_A(){}
    void show(){
        cout<<"This is Product_A"<<endl;
    }
};

//产品2
class Product_B:public Product{
public:
    Product_B(){}
    void show(){
        cout<<"This is Product_B"<<endl;
    }
};


class SimpleFactory{
public:
    Product* CreateProduct(string);
};

Product* SimpleFactory::CreateProduct(string Name){//简单工厂：在工厂内部通过逻辑判断，来生产不同类型的产品
    Product* _Product=nullptr;
    if(Name=="A"){
        _Product= new Product_A();
    }
    else{
        _Product=new Product_B();
    }
    return _Product;
}

int main(){
    SimpleFactory MyFactor;
    auto _Product=MyFactor.CreateProduct("A");
    _Product->show();
    delete _Product;
    _Product=MyFactor.CreateProduct("B");
    _Product->show();
    delete _Product;
    getchar();
    return 0;
}

普通工厂：

#include<iostream>
using namespace std;


//---------------------------------------

//产品类（抽象类，不能实例化）
class Product{
public:
    Product(){}
    virtual void show()=0;  //纯虚函数
};


//产品1
class Product_A:public Product{
public:
    Product_A(){}
    void show(){
        cout<<"This is Product_A"<<endl;
    }
};

//产品2
class Product_B:public Product{
public:
    Product_B(){}
    void show(){
        cout<<"This is Product_B"<<endl;
    }
};

//-------------------------


class Factory{//抽象类
    public:
    virtual Product* CreateProduct()=0;
};

class Factor_A:public Factory{//工厂类A，只生产A产品
    public:
    Product* CreateProduct(){
        Product* _Product=nullptr;
        _Product=new Product_A();
        return _Product;
    }
};

class Factor_B:public Factory{//工厂类B，只生产B产品
    public:
    Product* CreateProduct(){
        Product* _Product=nullptr;
        _Product= new Product_B();
        return _Product;
    }
};

int main(){
    Product* _Product=nullptr;
    auto MyFactory_A=new Factor_A();
    _Product=MyFactory_A->CreateProduct();// 调用产品A的工厂来生产A产品
    _Product->show();
    delete _Product;
    
    auto MyFactory_B=new Factor_B();
    _Product=MyFactory_B->CreateProduct();// 调用产品B的工厂来生产B产品
    _Product->show();
    delete _Product;
    
    getchar();
    return 0;
}

抽象工厂：

#include<iostream>
using namespace std;

//---------------------------------------

class Product_1{//产品类1，有两个子类：A1、B1
public:
    Product_1(){}
    virtual void show()=0;  //纯虚函数
};


//产品A_1
class Product_A_1:public Product_1{
public:
    Product_A_1(){}
    void show(){
        cout<<"This is Product_A_1"<<endl;
    }
};

//产品B_1
class Product_B_1:public Product_1{
public:
    Product_B_1(){}
    void show(){
        cout<<"This is Product_B_1"<<endl;
    }
};


class Product_2{//产品类2，有两个子类：A2、B2
    public:
    Product_2(){}
    virtual void show()=0;  //纯虚函数
};

//产品A_2
class Product_A_2:public Product_2{
public:
    Product_A_2(){}
    void show(){
        cout<<"This is Product_A_2"<<endl;
    }
};

//产品B_2
class Product_B_2:public Product_2{
public:
    Product_B_2(){}
    void show(){
        cout<<"This is Product_B_2"<<endl;
    }
};
//-------------------------

//抽象工厂类，有两个子工厂类：工厂A、工厂B
class AbstractFactory{
    public:
    virtual Product_1* CreateProduct_1()=0;
    virtual Product_2* CreateProduct_2()=0;
};

class Factory_A:public AbstractFactory{ //工厂类A，生产A1+A2
    public:
    Product_1* CreateProduct_1(){
        Product_1* _Product_1=nullptr;
        _Product_1=new Product_A_1();
        return _Product_1;
    }
    Product_2* CreateProduct_2(){
        Product_2* _Product_2=nullptr;
        _Product_2=new Product_A_2();
        return _Product_2;
    }
};

class Factory_B:public AbstractFactory{ //工厂类B，生产B1+B2
    public:
    Product_1* CreateProduct_1(){
        Product_1* _Product_1=nullptr;
        _Product_1=new Product_B_1();
        return _Product_1;
    }
    Product_2* CreateProduct_2(){
        Product_2* _Product_2=nullptr;
        _Product_2=new Product_B_2();
        return _Product_2;
    }
};


int main(){
    AbstractFactory* _AbstractFactory=nullptr;
    _AbstractFactory=new Factory_A();//指向工厂A
    Product_1* _Product_1=nullptr;
    Product_2* _Product_2=nullptr;
    
    _Product_1=_AbstractFactory->CreateProduct_1();//工厂A生产A_1产品
    _Product_1->show();
    delete _Product_1;
    
    _Product_2= _AbstractFactory->CreateProduct_2();//工厂A生产A_2产品
    _Product_2->show();
    delete _Product_2;

    delete _AbstractFactory;

    _AbstractFactory=new Factory_B();//指向工厂B

    _Product_1=_AbstractFactory->CreateProduct_1();//工厂B生产B_1产品
    _Product_1->show();
    delete _Product_1;
    
    _Product_2= _AbstractFactory->CreateProduct_2();//工厂B生产B_2产品
    _Product_2->show();
    delete _Product_2;

    delete _AbstractFactory;

    getchar();
    return 0;
}