/*Rob Duckles, 200012/30/00MemberThread allows you to call class methods in seperate threadswhile retaining the ability to use member variables of the class.Problem:Thread creation is built around C-style functions;There is no way to execute class method as a seperate threadunless defined as static.  Static methods do not have access to member variables.This is because normal methods have an implicit first argument: the _this_ pointer.Usage:#include <process.h>...TestClass testclass;...MemberThread<TestClass> memberthread;memberthread.pObj = &testclassmemberthread.pFn  = &TestClass::FunctionToCall;memberthread.BeginThread();Or just:memberthread.BeginThread(&testclass, &TestClass::FunctionToCall);*/template <class ObjType> class MemberThread  {public:	ObjType *pObj;			//pointer to class instance (instead of an implicit _this_ ptr)	void (ObjType::*pFn)();	//pointer to the function to be called	MemberThread(): pObj(NULL), pFn(NULL) {} //initializationprivate:	//structure passed to thread	struct ThreadArgs_t	{		ObjType *p;				//pointer to object 		void(ObjType::*pmf)();	//pointer to member function		//constructor		ThreadArgs_t(ObjType *pObj, void(ObjType::*pFn)()): p(pObj), pmf(pFn){} 	};public:	BOOL BeginThread()	{		if ((pObj == NULL) || (pFn == NULL))		{			return FALSE;	//exit if variables haven't been set		}		//init args to pass to thread		ThreadArgs_t* pThreadArgs_s;		if (NULL == (pThreadArgs_s = new ThreadArgs_t(pObj, pFn)))		{			return FALSE;		}		DWORD thread_id;		//begin thread with proper args, sent to intermediary function		if (NULL == CreateThread(NULL, 0, MemberThread::intermediary, pThreadArgs_s, 			0, &thread_id)) 		{			//if failed, cleanup			delete pThreadArgs_s;			return FALSE;		}		return TRUE;	}	//in case you want to do it all in one call	BOOL BeginThread(ObjType *p, void(ObjType::*pmf)())	{		pObj = p;		pFn  = pmf;		return BeginThread();	}private:	//does internal work	static DWORD WINAPI intermediary(void *ptr)	{		if (!ptr)		{			ExitThread(0);		}		//retrieve args		ThreadArgs_t *pThreadArgs_s = (ThreadArgs_t *)ptr;		//retrieve pointer to class object		ObjType* pObj = pThreadArgs_s->p;		//retrieve pointer to function		void (ObjType::*pFn)() = pThreadArgs_s->pmf;		//cleanup		delete pThreadArgs_s;		if ((!pObj) || (!pFn))		{			ExitThread(0);		}		//call member function		(pObj->*pFn)();		//thus the thread ends		ExitThread(0);	}};