Eric Lemings wrote:
-----Original Message-----
From: Martin Sebor [mailto:[EMAIL PROTECTED]
Sent: Monday, June 23, 2008 2:10 PM
To: dev@stdcxx.apache.org
Subject: Re: svn commit: r668225 -
/stdcxx/branches/4.3.x/etc/config/src/VA_LIST_FUNC_MACRO.cpp
[EMAIL PROTECTED] wrote:
Author: elemings
Date: Mon Jun 16 09:31:03 2008
New Revision: 668225
URL: http://svn.apache.org/viewvc?rev=668225&view=rev
Log:
2008-06-16 Eric Lemings <[EMAIL PROTECTED]>
STDCXX-958
* etc/config/src/VA_LIST_FUNC_MACRO.cpp: Initial version of
configuration check for va-list function macros.
Out of curiosity, what do you expect to use this for? (FWIW,
I've often wished variadic macros were supported in C++
compilers but I could never come up with a workaround for
their absence, making them essentially unusable as a general
purpose feature.)
The most obvious use would be in RWTest printf-like functions.
I'm not sure how well variadic function macros mesh with variadic
templates but, if they do, I could take advantage of the feature
in tuples.
My point was that I couldn't find a way to use a feature
that depends on variadic macros on platforms where they
are not supported. In other words, I can't picture what
the #else branch below would look like:
#ifndef _RWSTD_NO_VARIADIC_MACROS
# define RW_ASSERT(expr, ...) \
rw_assert (expr, 0, __LINE__, __VA_LIST__)
#else
# define RW_ASSERT(expr, ???) ...
#endif
Martin
In any case, I figured we'll need the config test sooner or later.
If we do come up with a use for the feature, I'd like to
suggest renaming the config test VARIADIC_MACRO.cpp.
Fine by me. :)
Brad.
