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/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2011 University of Edinburgh
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
***********************************************************************/
#pragma once
#include "Factor.h"
#include "Word.h"
#include <iostream>
#include <boost/functional/hash.hpp>
#include <boost/unordered_set.hpp>
#include <set>
namespace Moses
{
/** Functor to create hash for words.
* @todo uses all factors, not just factor 0
*/
class NonTerminalHasher
{
public:
size_t operator()(const Word & k) const {
// Assumes that only the first factor is relevant.
const Factor * f = k[0];
return hash_value(*f);
}
};
/** Functor to test whether 2 words are the same
* @todo uses all factors, not just factor 0
*/
class NonTerminalEqualityPred
{
public:
bool operator()(const Word & k1, const Word & k2) const {
// Assumes that only the first factor is relevant.
const Factor * f1 = k1[0];
const Factor * f2 = k2[0];
return !(f1->Compare(*f2));
}
};
typedef boost::unordered_set<Word,
NonTerminalHasher,
NonTerminalEqualityPred> NonTerminalSet;
std::ostream& operator<<(std::ostream&, const NonTerminalSet&);
} // namespace Moses
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