+// std::hash and std::tr1::hash definitions -*- C++ -*-
+
+// Copyright (C) 2007 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library. This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 2, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this library; see the file COPYING. If not, write to
+// the Free Software Foundation, 51 Franklin Street, Fifth Floor,
+// Boston, MA 02110-1301, USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction. Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License. This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+#include <cstddef>
+#include <string>
+
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
+#include <functional>
+# define _GLIBCXX_BEGIN_NAMESPACE_TR1
+# define _GLIBCXX_END_NAMESPACE_TR1
+#else
+#include <tr1/functional>
+# define _GLIBCXX_INCLUDE_AS_TR1
+# define _GLIBCXX_BEGIN_NAMESPACE_TR1 namespace tr1 {
+# define _GLIBCXX_END_NAMESPACE_TR1 }
+#endif
+
+namespace std
+{
+_GLIBCXX_BEGIN_NAMESPACE_TR1
+
+ template<>
+ size_t
+ hash<string>::operator()(string __s) const
+ { return _Fnv_hash<>::hash(__s.data(), __s.length()); }
+
+ template<>
+ size_t
+ hash<const string&>::operator()(const string& __s) const
+ { return _Fnv_hash<>::hash(__s.data(), __s.length()); }
+
+#ifdef _GLIBCXX_USE_WCHAR_T
+ template<>
+ size_t
+ hash<wstring>::operator()(wstring __s) const
+ {
+ const char* __p = reinterpret_cast<const char*>(__s.data());
+ return _Fnv_hash<>::hash(__p, __s.length() * sizeof(wchar_t));
+ }
+
+ template<>
+ size_t
+ hash<const wstring&>::operator()(const wstring& __s) const
+ {
+ const char* __p = reinterpret_cast<const char*>(__s.data());
+ return _Fnv_hash<>::hash(__p, __s.length() * sizeof(wchar_t));
+ }
+#endif
+
+_GLIBCXX_END_NAMESPACE_TR1
+}
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