动态创建

#ifndef _DYN_CREATE_H_
#define _DYN_CREATE_H_


using namespace std;
#include "map"
#include <string>


typedef void* (*FUNC)(void);
class DynamicCreateObj
{
public:
	static void* CreateObject(const string& objName)
	{
		map<string,FUNC>::const_iterator It;
		It = mapClass.find(objName);
		if (It == mapClass.end())
		{
			return 0;
		}
		return It->second();
	}
	static void AddClass(const string& objName, FUNC fun)
	{
		mapClass[objName] = fun;
	}


private:
	static map<string, FUNC> mapClass;
};


__declspec(selectany) map<string, FUNC> DynamicCreateObj::mapClass;


class RegisterClass
{
public:
	RegisterClass(const string& objName, FUNC fun)
	{
		DynamicCreateObj::AddClass(objName,fun);
	}
};


#define  REGISTER_CLASS(class_name) \
class class_name##Register			\
{									\
	public:							\
	static void* NewInstance()		\
	{								\
		return new class_name;		\
	}								\
	private:						\
	static RegisterClass reg;		\
};									\
RegisterClass class_name##Register::reg(#class_name,class_name##Register::NewInstance);


#endif //_DYN_CREATE_H_