FIX: You receive a C2004 error message when you initiate a class template that uses a function pointer as a template parameter in Visual C++ 6.0 (216722)

The information in this article applies to:

Microsoft Visual C++, 32-bit Enterprise Edition 6.0
Microsoft Visual C++, 32-bit Professional Edition 6.0
Microsoft Visual C++, 32-bit Learning Edition 6.0

This article was previously published under Q216722

SYMPTOMS

When initiating a class template that uses a function pointer as a template parameter, you may receive the following error message:

error C2440: ''specialization'' : cannot convert from 'function prototype' to ''int (__cdecl *)( *)''

STATUS

Microsoft has confirmed that this is a bug in the Microsoft products that are listed in the "Applies to" section. This bug was corrected in Visual Studio 6.0 Service Pack 3.

For more information about Visual Studio service packs, click the following article numbers to view the articles in the Microsoft Knowledge Base:

194022 Visual Studio 6.0 service packs, what, where, why

194295 How to tell that a Visual Studio service pack is installed

MORE INFORMATION

Steps to reproduce the behavior

Use the following sample code to recreate the error message.

template < class T, int (*pfn)(T *)>
class F
{
public:
	int Test( T *pb ) {
    	return (*pfn)(	pb );
	}
};

int Bar( int *pb ) {
	return *pb;
}

F<int,&Bar> f;

Modification Type:	Major	Last Reviewed:	9/30/2005
Keywords:	kbBug kbCompiler kbCPPonly kbfix kbVC600fix kbVS600sp3fix KB216722 kbAudDeveloper