| // '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 |