libstdc++-v3/src/c++11/cxx11-hash_tr1.cc

   1 // std::tr1::hash definitions with new string -*- C++ -*-
   2
   3 // Copyright (C) 2014-2017 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // Under Section 7 of GPL version 3, you are granted additional
  17 // permissions described in the GCC Runtime Library Exception, version
  18 // 3.1, as published by the Free Software Foundation.
  19
  20 // You should have received a copy of the GNU General Public License and
  21 // a copy of the GCC Runtime Library Exception along with this program;
  22 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 // <http://www.gnu.org/licenses/>.
  24
  25 #define _GLIBCXX_USE_CXX11_ABI 1
  26 #include <string>
  27
  28 #if ! _GLIBCXX_USE_DUAL_ABI
  29 # error This file should not be compiled for this configuration.
  30 #endif
  31
  32 #include <tr1/functional>
  33 namespace std _GLIBCXX_VISIBILITY(default)
  34 {
  35   namespace tr1
  36   {
  37   template<>
  38     size_t
  39     hash<string>::operator()(string __s) const
  40     { return _Fnv_hash::hash(__s.data(), __s.length()); }
  41
  42   template<>
  43     size_t
  44     hash<const string&>::operator()(const string& __s) const
  45     { return _Fnv_hash::hash(__s.data(), __s.length()); }
  46
  47 #ifdef _GLIBCXX_USE_WCHAR_T
  48   template<>
  49     size_t
  50     hash<wstring>::operator()(wstring __s) const
  51     { return _Fnv_hash::hash(__s.data(), __s.length() * sizeof(wchar_t)); }
  52
  53   template<>
  54     size_t
  55     hash<const wstring&>::operator()(const wstring& __s) const
  56     { return _Fnv_hash::hash(__s.data(), __s.length() * sizeof(wchar_t)); }
  57 #endif
  58   }
  59 }