FIX: C2440 Using Function Pointer As Class Template Argument

ID: Q216722

The information in this article applies to:

Microsoft Visual C++, 32-bit Editions, version 6.0

SYMPTOMS

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

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

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article.

This bug was corrected in Visual Studio 6.0 Service Pack 3. For more information about Visual Studio service packs, please see the following articles in the Microsoft Knowledge Base:

Q194022 INFO: Visual Studio 6.0 Service Packs, What, Where, Why

Q194295 HOWTO: Tell That Visual Studio 6.0 Service Packs Are Installed

MORE INFORMATION

Steps to Reproduce 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;

Additional query words:

Keywords : kbservicepack kbCompiler kbCPPonly kbVC600bug kbVC600fix kbVS600sp2 kbVS600SP1 kbVS600sp3fix
Version : winnt:6.0
Platform : winnt
Issue type : kbbug