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// $Id$
/***********************************************************************
Moses - factored phrase-based language decoder
Copyright (C) 2006 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 <ostream>
#include <string>
#include <vector>
#include "util/string_piece.hh"
namespace Moses2
{
struct FactorFriend;
class FactorCollection;
/** Represents a factor (word, POS, etc).
* A Factor has a contiguous identifier and string value.
*/
class Factor
{
friend std::ostream& operator<<(std::ostream&, const Factor&);
// only these classes are allowed to instantiate this class
friend class FactorCollection;
friend struct FactorFriend;
// FactorCollection writes here.
// This is mutable so the pointer can be changed to pool-backed memory.
mutable StringPiece m_string;
size_t m_id;
//! protected constructor. only friend class, FactorCollection, is allowed to create Factor objects
Factor() {
}
// Needed for STL containers. They'll delegate through FactorFriend, which is never exposed publicly.
Factor(const Factor &factor) :
m_string(factor.m_string), m_id(factor.m_id) {
}
// Not implemented. Shouldn't be called.
Factor &operator=(const Factor &factor);
public:
//! original string representation of the factor
StringPiece GetString() const {
return m_string;
}
//! contiguous ID
inline size_t GetId() const {
return m_id;
}
/** transitive comparison between 2 factors.
* -1 = less than
* +1 = more than
* 0 = same
*/
inline int Compare(const Factor &compare) const {
if (this < &compare) return -1;
if (this > &compare) return 1;
return 0;
}
//! transitive comparison used for adding objects into FactorCollection
inline bool operator<(const Factor &compare) const {
return this < &compare;
}
// quick equality comparison. Not used
inline bool operator==(const Factor &compare) const {
return this == &compare;
}
};
size_t hash_value(const Factor &f);
}
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