工厂模式，根据ID创建对应的实例类

工厂模式，根据ID创建对应的实例类

//

//  main.cpp

//  TestCPP1

//

//  Created by bianchx on 15/4/27.

//  Copyright (c) 2015年 bianchx. All rights reserved.

//



#include <iostream>

#include <map>



class BaseClass

{

public:

    virtual void print()

    {

        std::cout << __FUNCTION__ << std::endl;

    }

};





typedef BaseClass *(*CreateBase)();



static std::map<long, CreateBase> _map;



class Factory

{

public:

    

    static BaseClass *createInstanse(long id)

    {

        return _map.find(id)->second();

    }

};



template <typename T>

struct ClassRegister:BaseClass {

    ClassRegister(long _id)

    {

        _map[_id] = &(ClassRegister::createT);

    }

    

    static BaseClass* createT()

    {

        return new T();

    }

};



class ClassA:public BaseClass

{

public:

    static ClassRegister<ClassA> reg;

    

    virtual void print()

    {

        std::cout << "ClassA" << std::endl;

    }

};



ClassRegister<ClassA> ClassA::reg(1);



class ClassB:public BaseClass

{

private:

    static ClassRegister<ClassB> reg;

public:

    virtual void print()

    {

        std::cout << "ClassB" << std::endl;

    }

};



ClassRegister<ClassB> ClassB::reg(2);





int main(int argc, const char * argv[]) {

    

    Factory::createInstanse(1)->print();

    Factory::createInstanse(2)->print();

    

    return 0;

}