spot 2.3.4

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hashfunc.hh
1 // -*- coding: utf-8 -*-
2 // Copyright (C) 2015 Laboratoire de Recherche et Développement
3 // de l'Epita (LRDE)
4 // Copyright (C) 2004, 2005 Laboratoire d'Informatique de Paris 6 (LIP6),
5 // département Systèmes Répartis Coopératifs (SRC), Université Pierre
6 // et Marie Curie.
7 //
8 // This file is part of Spot, a model checking library.
9 //
10 // Spot is free software; you can redistribute it and/or modify it
11 // under the terms of the GNU General Public License as published by
12 // the Free Software Foundation; either version 3 of the License, or
13 // (at your option) any later version.
14 //
15 // Spot is distributed in the hope that it will be useful, but WITHOUT
16 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17 // or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
18 // License for more details.
19 //
20 // You should have received a copy of the GNU General Public License
21 // along with this program. If not, see <http://www.gnu.org/licenses/>.
22
23 #pragma once
24
25 #include <cstddef>
26
27 namespace spot
28 {
31
34
39 inline size_t
40 wang32_hash(size_t key)
41 {
42 // We assume that size_t has at least 32bits.
43 key += ~(key << 15);
44 key ^= (key >> 10);
45 key += (key << 3);
46 key ^= (key >> 6);
47 key += ~(key << 11);
48 key ^= (key >> 16);
49 return key;
50 }
51
58 inline size_t
59 knuth32_hash(size_t key)
60 {
61 // 2654435761 is the golden ratio of 2^32. The right shift of 3
62 // bits assumes that all objects are aligned on a 8 byte boundary.
63 return (key >> 3) * 2654435761U;
64 }
66 }
spot
Definition: graph.hh:33
spot::wang32_hash
size_t wang32_hash(size_t key)
Thomas Wang's 32 bit hash function.
Definition: hashfunc.hh:40
spot::op::U
until
spot::knuth32_hash
size_t knuth32_hash(size_t key)
Knuth's Multiplicative hash function.
Definition: hashfunc.hh:59

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