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101 lines
2.7 KiB
C++
101 lines
2.7 KiB
C++
// $Id$
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/***********************************************************************
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Moses - factored phrase-based language decoder
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Copyright (C) 2006 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 <ostream>
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#include <string>
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#include "TypeDef.h"
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#include "Util.h"
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#include "util/string_piece.hh"
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namespace Moses
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{
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struct FactorFriend;
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class FactorCollection;
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/** Represents a factor (word, POS, etc).
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* A Factor has a contiguous identifier and string value.
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*/
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class Factor
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{
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friend std::ostream& operator<<(std::ostream&, const Factor&);
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// only these classes are allowed to instantiate this class
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friend class FactorCollection;
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friend struct FactorFriend;
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// FactorCollection writes here.
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// This is mutable so the pointer can be changed to pool-backed memory.
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mutable StringPiece m_string;
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size_t m_id;
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//! protected constructor. only friend class, FactorCollection, is allowed to create Factor objects
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Factor() {}
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// Needed for STL containers. They'll delegate through FactorFriend, which is never exposed publicly.
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Factor(const Factor &factor) : m_string(factor.m_string), m_id(factor.m_id) {}
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// Not implemented. Shouldn't be called.
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Factor &operator=(const Factor &factor);
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public:
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//! original string representation of the factor
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StringPiece GetString() const {
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return m_string;
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}
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//! contiguous ID
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inline size_t GetId() const {
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return m_id;
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}
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/** transitive comparison between 2 factors.
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* -1 = less than
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* +1 = more than
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* 0 = same
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*/
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inline int Compare(const Factor &compare) const {
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if (this < &compare)
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return -1;
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if (this > &compare)
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return 1;
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return 0;
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}
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//! transitive comparison used for adding objects into FactorCollection
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inline bool operator<(const Factor &compare) const {
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return this < &compare;
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}
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// quick equality comparison. Not used
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inline bool operator==(const Factor &compare) const {
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return this == &compare;
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}
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TO_STRING();
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};
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size_t hash_value(const Factor &f);
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}
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