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hash_fun.h
// 'struct hash' from SGI -*- C++ -*- // Copyright (C) 2001-2018 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 3, 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. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /* * Copyright (c) 1996-1998 * Silicon Graphics Computer Systems, Inc. * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Silicon Graphics makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. * * * Copyright (c) 1994 * Hewlett-Packard Company * * Permission to use, copy, modify, distribute and sell this software * and its documentation for any purpose is hereby granted without fee, * provided that the above copyright notice appear in all copies and * that both that copyright notice and this permission notice appear * in supporting documentation. Hewlett-Packard Company makes no * representations about the suitability of this software for any * purpose. It is provided "as is" without express or implied warranty. * */ /** @file backward/hash_fun.h * This file is a GNU extension to the Standard C++ Library (possibly * containing extensions from the HP/SGI STL subset). */ #ifndef _BACKWARD_HASH_FUN_H #define _BACKWARD_HASH_FUN_H 1 #include <bits/c++config.h> namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION using std::size_t; template<class _Key> struct hash { }; inline size_t __stl_hash_string(const char* __s) { unsigned long __h = 0; for ( ; *__s; ++__s) __h = 5 * __h + *__s; return size_t(__h); } template<> struct hash<char*> { size_t operator()(const char* __s) const { return __stl_hash_string(__s); } }; template<> struct hash<const char*> { size_t operator()(const char* __s) const { return __stl_hash_string(__s); } }; template<> struct hash<char> { size_t operator()(char __x) const { return __x; } }; template<> struct hash<unsigned char> { size_t operator()(unsigned char __x) const { return __x; } }; template<> struct hash<signed char> { size_t operator()(unsigned char __x) const { return __x; } }; template<> struct hash<short> { size_t operator()(short __x) const { return __x; } }; template<> struct hash<unsigned short> { size_t operator()(unsigned short __x) const { return __x; } }; template<> struct hash<int> { size_t operator()(int __x) const { return __x; } }; template<> struct hash<unsigned int> { size_t operator()(unsigned int __x) const { return __x; } }; template<> struct hash<long> { size_t operator()(long __x) const { return __x; } }; template<> struct hash<unsigned long> { size_t operator()(unsigned long __x) const { return __x; } }; _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif