C / C++ / MFC

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

	void SomeFunc()
	{
		Stop();
	}
};

class Derived : public Base
{
public:
	void Stop()
	{
		cout << "Derived" ;
	}
};

int main()
{
	Base * b = new Derived();
	b->SomeFunc();
}

<br />
template <class T><br />
class IMultiThreaded : protected A, public B<T>, public C, public D<br />
{<br />
public:<br />
virtual ~CBase();<br />
<br />
vitual DWORD Stop(DWORD* pdwCode, DWORD dwWaitTimeOut = DEFAULT_TIMEOUT) = 0;<br />
};<br />
<br />
// implementation of CBase<br />
template <class T><br />
CBase<T>::~CBase()<br />
{<br />
if( m_bSomeConstant ) Stop(NULL); /* static cast removed. Must solve unresolved external symbol error */<br />
}<br />

<br />
<class><br />
template <class T><br />
class CDerived : public CBase<T><br />
{<br />
public:<br />
virtual ~CDerived() { }<br />
virtual DWORD Stop(DWORD* pdwCode, DWORD dwWaitTimeOut = DEFAULT_TIMEOUT);<br />
}<br />
<br />
// implementation of CDerived<br />
template <class T><br />
DWORD CDerived<T>::Stop(DWORD *pdwCode, DWORD dwWaitTimeOut)<br />
{<br />
// some code<br />
}<br />

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"Ideas are a dime a dozen. People who put them into action are priceless." - Unknown