Default parameters in typedef for function

[=?iso-8859-1?Q?Schwarzbauer_G=FCnter?=]

Hello,

Does the C++ standard allow default parameters when defining a typedef for a
function type, e.g.

typedef void (*TYPE_Report)(const char* message, const char* details = 0);

This was accepted by MS Visual C++ 6.0, but is rejected in Visual Studio
..NET 2003.
I assume that this change might be because Visual Studio .NET is more C++
standard compliant than previous versions were.
Is this correct?

Is there any way to use default parameters for function types?

thanks
Günter

 

[Mike Wahler]

Hello,

Does the C++ standard allow default parameters when defining a typedef for a
function type, e.g.

typedef void (*TYPE_Report)(const char* message, const char* details = 0);

This was accepted by MS Visual C++ 6.0, but is rejected in Visual Studio
.NET 2003.
I assume that this change might be because Visual Studio .NET is more C++
standard compliant than previous versions were.
Is this correct?
Yes.


Is there any way to use default parameters for function types?

Not that I know of.

===================================================================
ISO/IEC 14882:1998(E)

8.3.6 Default arguments

3 A default argument expression shall be specified only in the
parameter-­declaration­-clause of a function declaration or in
a template­-parameter (14.1). If it is specified in a parameter­-
declaration­-clause, it shall not occur within a declarator or
abstract­-declarator of a parameter­-declaration.(88)


(88) This means that default arguments cannot appear, for
example, in declarations of pointers to functions, references
to functions, or typedef declarations.
===================================================================

-Mike

 

[=?Windows-1252?Q?Schwarzbauer_G=FCnter?=]

Yes.

Mike , thanks for the quick answer...

Not that I know of.

.... although I don't like it.


Seems like this was no accident, but a deliberate decision.
Does someone know why this was decided this way?

Günter

 

[Victor Bazarov]

[...]
Seems like this was no accident, but a deliberate decision.
Does someone know why this was decided this way?

If somebody does, it would be in comp.std.c++.

V