hash_fun.h

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00001 /*****************************************************************************/
00002 /*!
00003  *\file hash_fun.h
00004  *\brief hash functions
00005  *
00006  * Author: Alexander Fuchs
00007  *
00008  * Created: Fri Oct 20 11:04:00 2006
00009  *
00010  * <hr>
00011  *
00012  * License to use, copy, modify, sell and/or distribute this software
00013  * and its documentation for any purpose is hereby granted without
00014  * royalty, subject to the terms and conditions defined in the \ref
00015  * LICENSE file provided with this distribution.
00016  * 
00017  * <hr>
00018  */
00019 /*****************************************************************************/
00020 
00021 /*
00022  * Copyright (c) 1996-1998
00023  * Silicon Graphics Computer Systems, Inc.
00024  *
00025  * Permission to use, copy, modify, distribute and sell this software
00026  * and its documentation for any purpose is hereby granted without fee,
00027  * provided that the above copyright notice appear in all copies and
00028  * that both that copyright notice and this permission notice appear
00029  * in supporting documentation.  Silicon Graphics makes no
00030  * representations about the suitability of this software for any
00031  * purpose.  It is provided "as is" without express or implied warranty.
00032  *
00033  *
00034  * Copyright (c) 1994
00035  * Hewlett-Packard Company
00036  *
00037  * Permission to use, copy, modify, distribute and sell this software
00038  * and its documentation for any purpose is hereby granted without fee,
00039  * provided that the above copyright notice appear in all copies and
00040  * that both that copyright notice and this permission notice appear
00041  * in supporting documentation.  Hewlett-Packard Company makes no
00042  * representations about the suitability of this software for any
00043  * purpose.  It is provided "as is" without express or implied warranty.
00044  *
00045  */
00046 
00047 // this is basically (modulo renaming and namespace) the SGI implementation:
00048 // http://www.sgi.com/tech/stl/stl_hash_fun.h
00049 
00050 #ifndef _cvc3__hash__hash_fun_h_
00051 #define _cvc3__hash__hash_fun_h_
00052 
00053 // to get size_t
00054 #include <cstddef>
00055 
00056 
00057 namespace Hash {
00058   using std::size_t;
00059 
00060   template <class _Key> struct hash { };
00061   
00062   inline size_t __stl_hash_string(const char* __s)
00063   {
00064     unsigned long __h = 0; 
00065     for ( ; *__s; ++__s)
00066       __h = 5*__h + *__s;
00067     
00068     return size_t(__h);
00069   }
00070   
00071   template<> struct hash<char*> {
00072     size_t operator()(const char* __s) const { return __stl_hash_string(__s); }
00073   };
00074 
00075   template<> struct hash<const char*>
00076   {
00077     size_t operator()(const char* __s) const { return __stl_hash_string(__s); }
00078   };
00079   
00080   template<> struct hash<char> {
00081     size_t operator()(char __x) const { return __x; }
00082   };
00083 
00084   template<> struct hash<unsigned char> {
00085     size_t operator()(unsigned char __x) const { return __x; }
00086   };
00087   
00088   template<> struct hash<signed char> {
00089     size_t operator()(unsigned char __x) const { return __x; }
00090   };
00091   
00092   template<> struct hash<short> {
00093     size_t operator()(short __x) const { return __x; }
00094   };
00095 
00096   template<> struct hash<unsigned short> {
00097     size_t operator()(unsigned short __x) const { return __x; }
00098   };
00099 
00100   template<> struct hash<int> {
00101     size_t operator()(int __x) const { return __x; }
00102   };
00103 
00104   template<> struct hash<unsigned int> {
00105     size_t operator()(unsigned int __x) const { return __x; }
00106   };
00107 
00108   template<> struct hash<long> {
00109     size_t operator()(long __x) const { return __x; }
00110   };
00111 
00112   template<> struct hash<unsigned long> {
00113     size_t operator()(unsigned long __x) const { return __x; }
00114   };
00115 
00116 }
00117 
00118 #endif

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