各位帮忙解释一下这行错误的意思

[kunkunpp]

我快疯了，在进行连接时报的鬼错误。
------------------------------------------------------------------------
MainThread.o(.text+0x20): In function `CMainThread::CMainThread[not-in-charge]()':
/home/kunp/UDPT/TestThread/MainThread.cpp:5: undefined reference to `vtable for CMainThread'
MainThread.o(.text+0x84): In function `CMainThread::CMainThread[in-charge]()':
/home/kunp/UDPT/TestThread/MainThread.cpp:5: undefined reference to `vtable for CMainThread'
--------------------------------------------------------------------------

附上
MainThread.h
-----------------------------------------------------------------------
#include "FDThread.h"
#include <iostream>

using namespace std;

class CMainThread : public CFDThread
{
public:
CMainThread();
~CMainThread();

protected:
int ThreadProc ();
void StopProc ();
};

#endif
-------------------------------------------------------------------------


MainThread.cpp
-------------------------------------------------------------------------
#include "MainThread.h"


CMainThread::CMainThread()
{
cout << "Create MAinThread...." << endl;
}

int CMainThread::ThreadProc ()
{
cout << "test" << endl;
return 0;
}

void CMainThread::StopProc()
{
cout << "stop" << endl;
}

[milefo]

没有入口函数啊,
加个空的main()都可以!

[leonchew]

呵呵，是啊！加main（）{}了

[leonchew]

呵呵，是啊！加main（）{}了

[kunkunpp]

谢谢，呵呵，本来是预留的接口，所以没有在main中调用，测试编译时搞的我想死，真的非常感谢。