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Diffstat (limited to 'libstdc++/include/ext/hash_fun.h')
| -rw-r--r-- | libstdc++/include/ext/hash_fun.h | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/libstdc++/include/ext/hash_fun.h b/libstdc++/include/ext/hash_fun.h new file mode 100644 index 0000000..16c0458 --- /dev/null +++ b/libstdc++/include/ext/hash_fun.h @@ -0,0 +1,172 @@ +// 'struct hash' from SGI -*- C++ -*- + +// Copyright (C) 2001, 2002, 2003, 2004, 2005 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. + +/* + * 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 ext/hash_fun.h + * This file is a GNU extension to the Standard C++ Library (possibly + * containing extensions from the HP/SGI STL subset). + */ + +#ifndef _HASH_FUN_H +#define _HASH_FUN_H 1 + +#include <cstddef> + +_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) + + 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 + +#endif |
