[Bug c++/9990] locale_facets.h contains invalid typedef

["bangerth at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #11 from bangerth at gmail dot com  2010-02-18 20:53 -------
(In reply to comment #10)
> I'm not sure to fully understand, Wolfgang: you mean, we should change that
> line in the library instead of dealing with a possible C++ issue here? That
> would be easy to do, just tell me the exact form you would like to see, whose
> correctness you are 101% sure about, and let's close this PR!

I think there are two issues:
1/ A possible bug in the C++ front end, though from what I read Nathan felt
   unsure about it.
2/ A poorly written typedef that, depending on the outcome of 1/ may or may
   not be invalid, but in any case isn't easy to understand to the human
   reader.

Ideally, there would be separate PRs about these two issues. I was just
addressing the second point, which could be solved by replacing
  typedef typename ctype::mask      mask;
by
  typedef typename __ctype_abstract_base<_CharT>::mask mask;
which makes it abundantly clear that ctype::mask is not meant to be a 
reference to the typedef we are currently declaring.

Best
 W.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=9990