[Bug libstdc++/52931] New: std::hash shouldn't be defined for unknown types

[Bug libstdc++/52931] New: std::hash shouldn't be defined for unknown types

[marc.glisse at normalesup dot org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52931

             Bug #: 52931
           Summary: std::hash shouldn't be defined for unknown types
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: marc.glisse@normalesup.org


As explained by Daniel Krügler in c++std-lib-32420 and nearby messages, the
default definition of std::hash is non-standard, it is supposed to be undefined
so we can test with sfinae whether hash was specialized for some type.

[Bug libstdc++/52931] std::hash shouldn't be defined for unknown types

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52931

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2012-04-11
         AssignedTo|unassigned at gcc dot       |paolo.carlini at oracle dot
                   |gnu.org                     |com
   Target Milestone|---                         |4.8.0
     Ever Confirmed|0                           |1

--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-04-11 10:01:56 UTC ---
No big deal.

[Bug libstdc++/52931] std::hash shouldn't be defined for unknown types

[paolo at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52931

--- Comment #2 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> 2012-04-11 11:27:57 UTC ---
Author: paolo
Date: Wed Apr 11 11:27:50 2012
New Revision: 186310

URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=186310
Log:
2012-04-11  Paolo Carlini  <paolo.carlini@oracle.com>

    PR libstdc++/52931
    * include/bits/functional_hash.h (struct hash): Remove definition.
    * testsuite/20_util/hash/52931.cc: New.

Added:
    trunk/libstdc++-v3/testsuite/20_util/hash/52931.cc
Modified:
    trunk/libstdc++-v3/ChangeLog
    trunk/libstdc++-v3/include/bits/functional_hash.h

[Bug libstdc++/52931] std::hash shouldn't be defined for unknown types

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52931

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-04-11 11:29:34 UTC ---
Done.