9d3d032c7d9686fbd31c776f65155367d3e19dcd |
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06-Mar-2014 |
Peter Collingbourne <peter@pcc.me.uk> |
Do not derive __gnu_cxx::hash<T> from std::hash<T>. Instead, define explicit specializations for the basic types listed in the SGI documentation. This solves two problems: 1) Helps avoid silent ODR violations caused by the absence of a user-supplied __gnu_cxx::hash specialization in cases where a std::hash specialization exists (e.g. for std::string). 2) __gnu_cxx::hash semantics are slightly different to those of std::hash (for example, the former may dereference a pointer argument) so it is inappropriate for __gnu_cxx::hash to receive std::hash specializations by default. Differential Revision: http://llvm-reviews.chandlerc.com/D2747 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@203070 91177308-0d34-0410-b5e6-96231b3b80d8
/external/libcxx/test/extensions/hash/specializations.pass.cpp
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