c++模拟反射机制-方法1

用map实现反射的简单例子。

#include <iostream>
#include <string>
#include<map>

using  namespace  std;


class  Base
{ public :
    virtual  void  say()=0;
};

class  A: public  Base
{ public :
    virtual  void  say()
    {
        cout<< "This is A" <<endl;
    }
};

class  B: public  Base

{ public :
    virtual  void  say()
    {
        cout<< "This is B" <<endl;
    }
};

template  < typename  T>
Base *Create()                   //创建函数
{
    return  new  T;
}

typedef  Base*(*FUN)();
map<string, FUN> rmap;       //由类名到创建函数的映射



int  main()
{
    rmap[ "A" ]=Create<A>;      //注册
    rmap[ "B" ]=Create<B>;      //注册

    string str= "A" ;

    Base* p=rmap[str]();      //动态创建
    p->say();
    delete  p;

    str= "B" ;
    p=rmap[str]();          //动态创建
    p->say();
    delete  p;


}