C++实现反射

      最近作项目,使用C++.之前.Net和Java用的比较多一点.习惯了使用.Net(C#  or VB.Net or VC.Net)和Java提供的一些特性,到C++里面却没有了.我承认C++确实很强大,但用起来还是那么别扭,觉得C++就是没.Net和Java方便,缺少反射等这种很实用的技术的实现.

    我现在做的这个项目是用C++实现,通过类名称字符串就能够创建该类对象的实例.以下是代码实现,可能还需要加工以下,不过解释实现原理倒是可以的.

    #include "stdafx.h"#include "stdlib.h"#include <string>#include <map>using namespace std;class BaseClass{public: virtual bool DoWork()const=0;};typedef BaseClass* (*CreateObjectFunctionPtr)();namespace ClassFactory{ map<string,CreateObjectFunctionPtr> regClassList; void RegisterClass(string strKey,CreateObjectFunctionPtr CreateObjFun) { regClassList.insert(pair<string,CreateObjectFunctionPtr>(strKey,CreateObjFun)); } BaseClass* CreateInstance(string className) { CreateObjectFunctionPtr createFun=NULL; for(map<string,CreateObjectFunctionPtr>::iterator it=regClassList.begin();it!=classList.end();it++) { if(className==(*it).first) { createFun=(*it).second; } } if(createFun) { return createFun(); } return NULL; } void ReleaseObject(BaseClass * instance) { if(instance) { delete instance; instance=NULL; } }}#define REG_CLASS(ClassName) ClassFactory::RegisterClass(#ClassName,ClassName::CreateInstance)#define REFLECTABLE_CLASS(ClassName) public:/ static BaseClass *CreateInstance(){/ BaseClass* ref=(BaseClass *)new ClassName();/ return ref;/ }/class SubClass:public BaseClass{REFLECTABLE_CLASS(SubClass)public: char * GetClassInfo() { return "SubClass"; } bool DoWork() const { printf("I'm working/n"); return true; }};int _tmain(int argc, _TCHAR* argv[]){ REG_CLASS(SubClass); //注册类 SubClass * subClassInstance; BaseClass *instance ; instance=ClassFactory::CreateInstance("SubClass"); if(instance) { instance->DoWork(); subClassInstance= (SubClass *)instance; printf("The class Info :%s/n",subClassInstance->GetClassInfo()); } ClassFactory::ReleaseObject(instance); system("pause"); return 0;}