Re: Can't seem to get abstract to work in unmanaged class

I want to define something like an interface, however I
want one of the
methods to make use of a variable number of arguments and
since an interface
won't let me do that I figured an abstract class would be
the next best
thing. After reading
http://msdn2.microsoft.com/en-us/library/z8ew2153.aspx
I assumed I would be able to define this unmanaged C++
abstract class in
VS.NET 2003. However when I compile with the class
defined as:

#pragma once

#include <stdarg.h>

class ILogger abstract
{
public:
virtual void Log(short type, long severityLevel, const
char *format, ...) =
0;
virtual void LogArg(short type, long severityLevel, const
char *format,
va_list argList) = 0;
};

I get the following error:

...
c:\data\development\interface\logger.h(6) : error C2470:
'abstract' : looks
like
a function definition, but there is no formal parameter
list; skipping
apparent
body
...

If I remove 'abstract' it compiles fine.

What am I doing wrong?