[Bug c++/57] [DR 325] GCC can't parse a non-parenthesized comma in a template-id within a default argument

["llewelly at xmission dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From llewelly at xmission dot com  2004-04-30 16:36 -------
Subject: Re:  [DR 325] GCC can't parse a non-parenthesized comma in a template-id within a default argument

"bangerth at ices dot utexas dot edu" <gcc-bugzilla@gcc.gnu.org> writes:

> ------- Additional Comments From bangerth at ices dot utexas dot edu  2004-04-30 14:01 -------
> Subject: Re:  [DR 325] GCC can't parse a non-parenthesized comma in a template-id within a default argument
> 
> 
> How funny, the reference is indeed in the standard, it's the last declaration 
> on page 502, section 23.3.5.1. Maybe someone can see if there is a defect 
> report, though I can't seem to find one if it exists.
> 
> It's easy to work around, though, by just duplicating the constructor, and 
> having one take the third argument and one not taking it.
[snip]

The default argument expression can also be parenthesized:

template<class charT, class traits, class Allocator>
explicit
bitset(const basic_string<charT, traits, Allocator>& str,
  typename basic_string<charT, traits, Allocator>::size_type pos =0,
  typename basic_string<charT, traits, Allocator>::size_type n =
  (basic_string<charT, traits, Allocator>::npos));
  ^-extra parentheses--------------------------^

which is perhaps easier.



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57