mirror of
https://github.com/moses-smt/mosesdecoder.git
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67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
/***********************************************************************
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Moses - statistical machine translation system
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Copyright (C) 2006-2012 University of Edinburgh
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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***********************************************************************/
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#pragma once
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#include "TypeDef.h"
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#include "Word.h"
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#include <boost/functional/hash.hpp>
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namespace Moses
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{
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class TerminalHasher
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{
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public:
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// Generate a hash value for a word representing a terminal. It's
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// assumed that the same subset of factors will be active for all words
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// that are hashed.
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size_t operator()(const Word &t) const {
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size_t seed = 0;
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for (size_t i = 0; i < MAX_NUM_FACTORS; ++i) {
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const Factor *f = t[i];
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if (f) {
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boost::hash_combine(seed, *f);
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}
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}
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return seed;
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}
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};
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class TerminalEqualityPred
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{
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public:
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// Equality predicate for comparing words representing terminals. As
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// with the hasher, it's assumed that all words will have the same
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// subset of active factors.
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bool operator()(const Word &t1, const Word &t2) const {
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for (size_t i = 0; i < MAX_NUM_FACTORS; ++i) {
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const Factor *f1 = t1[i];
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const Factor *f2 = t2[i];
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if (f1 && f1->Compare(*f2)) {
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return false;
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}
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}
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return true;
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}
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};
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} // namespace Moses
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