171 lines
4.1 KiB
C++
171 lines
4.1 KiB
C++
// 'struct hash' from SGI -*- C++ -*-
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// Copyright (C) 2001-2019 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/*
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* Copyright (c) 1996-1998
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*
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* Copyright (c) 1994
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* Hewlett-Packard Company
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Hewlett-Packard Company makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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*/
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/** @file backward/hash_fun.h
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* This file is a GNU extension to the Standard C++ Library (possibly
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* containing extensions from the HP/SGI STL subset).
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*/
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#ifndef _BACKWARD_HASH_FUN_H
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#define _BACKWARD_HASH_FUN_H 1
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#include <bits/c++config.h>
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namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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using std::size_t;
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template<class _Key>
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struct hash { };
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inline size_t
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__stl_hash_string(const char* __s)
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{
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unsigned long __h = 0;
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for ( ; *__s; ++__s)
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__h = 5 * __h + *__s;
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return size_t(__h);
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}
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template<>
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struct hash<char*>
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{
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size_t
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operator()(const char* __s) const
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{ return __stl_hash_string(__s); }
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};
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template<>
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struct hash<const char*>
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{
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size_t
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operator()(const char* __s) const
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{ return __stl_hash_string(__s); }
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};
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template<>
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struct hash<char>
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{
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size_t
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operator()(char __x) const
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{ return __x; }
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};
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template<>
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struct hash<unsigned char>
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{
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size_t
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operator()(unsigned char __x) const
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{ return __x; }
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};
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template<>
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struct hash<signed char>
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{
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size_t
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operator()(unsigned char __x) const
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{ return __x; }
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};
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template<>
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struct hash<short>
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{
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size_t
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operator()(short __x) const
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{ return __x; }
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};
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template<>
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struct hash<unsigned short>
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{
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size_t
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operator()(unsigned short __x) const
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{ return __x; }
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};
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template<>
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struct hash<int>
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{
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size_t
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operator()(int __x) const
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{ return __x; }
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};
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template<>
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struct hash<unsigned int>
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{
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size_t
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operator()(unsigned int __x) const
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{ return __x; }
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};
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template<>
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struct hash<long>
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{
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size_t
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operator()(long __x) const
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{ return __x; }
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};
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template<>
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struct hash<unsigned long>
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{
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size_t
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operator()(unsigned long __x) const
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{ return __x; }
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};
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace
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#endif
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