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// 'struct hash' from SGI -*- C++ -*- |
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// Copyright (C) 2001-2021 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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|
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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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|
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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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|
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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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/* |
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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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|
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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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|
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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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|
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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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|
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using std::size_t; |
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|
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template<class _Key> |
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struct hash { }; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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_GLIBCXX_END_NAMESPACE_VERSION |
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} // namespace |
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|
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#endif |
