简单工厂

#include <iostream>
struct I_Pro
{
    virtual void fun() = 0;
};

class A : public I_Pro
{
public:
    virtual void fun();
};
void A::fun()
{
    std::cout << "funA" << std::endl;
}


class B : public I_Pro
{
public:
    virtual void fun();
};
void B::fun()
{
    std::cout << "funB" << std::endl;
}

struct I_Factry
{
    virtual I_Pro* createPro(int type) = 0;
};

class Factory : public I_Factry
{
    virtual I_Pro*  createPro(int type);
};

I_Pro* Factory::createPro(int type)
{
    I_Pro* ptr = nullptr;
    switch (type)
    {
    case 1:
        ptr = new A;
        break;
    case 2:
        ptr = new B;
        break;
    }
    return ptr;
}

int main()
{
    I_Factry* ptr = new Factory;//不知这里factory还要搞个抽象类，莫非是为了以后有可能有多个工厂考虑的
    I_Pro* pro = ptr->createPro(2);
    pro->fun();

    getchar();
    return 0;
}

现在写这样的的比以前清晰很多。