[Bug libstdc++/59167] New: Add a specialization for std::hash<__gnu_debug::string>

[Bug libstdc++/59167] New: Add a specialization for std::hash<__gnu_debug::string>

[bmerry at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59167

            Bug ID: 59167
           Summary: Add a specialization for
                    std::hash<__gnu_debug::string>
           Product: gcc
           Version: 4.8.1
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: bmerry at gmail dot com

I have code for which I am explicitly selecting debug containers from the
__gnu_debug namespace (I'm not using -D_GLIBCXX_DEBUG since it breaks the ABI
with Boost and I don't want to require people to rebuild Boost to use a debug
build of my code).

This mostly works, but when I try to use an unordered_map with
__gnu_debug::string as the key type I get errors because std::hash hasn't been
specialized for it. I can write my own specialization, but it would be nice if
the library just provided it.

Obviously the other variants (wstring, u16string, u32string should be handled
too).

[Bug libstdc++/59167] Add a specialization for std::hash<__gnu_debug::string>

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59167

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-04-09
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
#include <debug/string>
auto h = std::hash<__gnu_debug::string>{}({});




hh.cc:3:41: error: invalid use of incomplete type ‘struct
std::hash<__gnu_debug::basic_string<char> >’
 auto h = std::hash<__gnu_debug::string>{}({});
                                         ^
In file included from
/home/jwakely/gcc/5/include/c++/5.0.0/bits/basic_string.h:5466:0,
                 from /home/jwakely/gcc/5/include/c++/5.0.0/string:52,
                 from /home/jwakely/gcc/5/include/c++/5.0.0/debug/string:32,
                 from hh.cc:1:
/home/jwakely/gcc/5/include/c++/5.0.0/bits/functional_hash.h:58:12: note:
declaration of ‘struct std::hash<__gnu_debug::basic_string<char> >’
     struct hash;
            ^
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Subject: [Bug c++/65690] [5 Regression] typedef alignment lost since r219705
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide690

--- Comment #10 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Thu Apr  9 15:06:56 2015
New Revision: 221952

URL: https://gcc.gnu.org/viewcvs?rev"1952&root=gcc&view=rev
Log:
    PR c++/65690
    * tree.c (build_cplus_array_type): Layout type before variants are
    set, but copy over TYPE_SIZE and TYPE_SIZE_UNIT from the main
    variant.

    * c-c++-common/attr-aligned-1.c: New test.

Modified:
    trunk/gcc/cp/ChangeLog
    trunk/gcc/cp/tree.c
    trunk/gcc/testsuite/ChangeLog