579e8fc0a9
* src/sanity/style.test: Test for the missing header. * iface/ltsmin/check.test, src/kripketest/kripke.test, src/kripketest/parse_print_test.cc, src/ltlparse/fmterror.cc, src/ltltest/consterm.test, src/ltltest/kind.test, src/ltltest/length.test, src/ltltest/ltlfilt.test, src/ltltest/reduc.cc, src/ltltest/reduc.test, src/ltltest/reduc0.test, src/ltltest/reducpsl.test, src/ltltest/remove_x.test, src/ltltest/unabbrevwm.test, src/ltltest/utf8.test, src/ltltest/uwrm.test, src/ltlvisit/dump.cc, src/ltlvisit/remove_x.cc, src/misc/casts.hh, src/misc/fixpool.hh, src/misc/hashfunc.hh, src/misc/ltstr.hh, src/sanity/readme.test, src/taalgos/tgba2ta.cc, src/tgbaalgos/bfssteps.cc, src/tgbaalgos/stats.cc, src/tgbatest/acc.test, src/tgbatest/bitvect.test, src/tgbatest/complementation.test, src/tgbatest/cycles.test, src/tgbatest/degendet.test, src/tgbatest/dfs.test, src/tgbatest/dupexp.test, src/tgbatest/emptchkr.test, src/tgbatest/intvcomp.test, src/tgbatest/ltl2ta.test, src/tgbatest/ltl2ta2.test, src/tgbatest/ltlprod.test, src/tgbatest/maskacc.test, src/tgbatest/obligation.test, src/tgbatest/randpsl.test, src/tgbatest/readsat.cc, src/tgbatest/readsat.test, src/tgbatest/scc.test, src/tgbatest/sccsimpl.test, src/tgbatest/taatgba.test, src/tgbatest/tgbaread.test, src/tgbatest/tripprod.test, src/tgbatest/uniq.test, src/tgbatest/wdba.test: Add it.
66 lines
2.1 KiB
C++
66 lines
2.1 KiB
C++
// -*- coding: utf-8 -*-
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// Copyright (C) 2015 Laboratoire de Recherche et Développement
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// de l'Epita (LRDE)
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// Copyright (C) 2004, 2005 Laboratoire d'Informatique de Paris 6 (LIP6),
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// département Systèmes Répartis Coopératifs (SRC), Université Pierre
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// et Marie Curie.
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//
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// This file is part of Spot, a model checking library.
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//
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// Spot is free software; you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3 of the License, or
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// (at your option) any later version.
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//
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// Spot is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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// or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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// License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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#ifndef SPOT_MISC_HASHFUNC_HH
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# define SPOT_MISC_HASHFUNC_HH
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# include <cstddef>
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namespace spot
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{
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/// \addtogroup hash_funcs Hashing functions
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/// \ingroup misc_tools
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/// @{
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/// \brief Thomas Wang's 32 bit hash function.
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///
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/// Hash an integer amongst the integers.
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/// http://www.concentric.net/~Ttwang/tech/inthash.htm
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inline size_t
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wang32_hash(size_t key)
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{
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// We assume that size_t has at least 32bits.
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key += ~(key << 15);
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key ^= (key >> 10);
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key += (key << 3);
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key ^= (key >> 6);
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key += ~(key << 11);
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key ^= (key >> 16);
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return key;
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}
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/// \brief Knuth's Multiplicative hash function.
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///
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/// This function is suitable for hashing values whose
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/// high order bits do not vary much (ex. addresses of
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/// memory objects). Prefer spot::wang32_hash() otherwise.
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/// http://www.concentric.net/~Ttwang/tech/addrhash.htm
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inline size_t
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knuth32_hash(size_t key)
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{
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// 2654435761 is the golden ratio of 2^32. The right shift of 3
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// bits assumes that all objects are aligned on a 8 byte boundary.
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return (key >> 3) * 2654435761U;
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}
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/// @}
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}
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#endif // SPOT_MISC_HASHFUNC_HH
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