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/* This file is part of the FaCT++ DL reasoner
Copyright (C) 2003-2015 Dmitry Tsarkov and The University of Manchester
Copyright (C) 2015-2016 Dmitry Tsarkov
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
*/
#ifndef TLABELLER_H
#define TLABELLER_H
#include "fpp_assert.h"
#include "tCounter.h"
/** define class that implements support for labelling entries with
* cheap 'unselect' operation. An external entity is 'marked' iff
* it's value equal to the internal counter.
*/
class TLabeller
{
private: // internal type definition
/// type of a counter
typedef TCounter<unsigned int> LabelCounter;
public: // type interface
/// define integral type of a label
typedef LabelCounter::IntType LabelType;
protected: // members
/// counter
LabelCounter counter;
public: // interface
/// init c'tor
TLabeller ( void ) : counter(1) {}
/// copy c'tor
TLabeller ( const TLabeller& copy ) : counter(copy.counter) {}
/// assignment
TLabeller& operator= ( const TLabeller& copy )
{
counter = copy.counter;
return *this;
}
/// d'tor
~TLabeller ( void ) {}
// operations with Labeller
/// create a new label value
void newLabel ( void )
{
counter.inc();
fpp_assert ( counter.val() != 0 );
}
// operations with Labels
/// set given label's value to the counter's one
void set ( LabelType& lab ) const { lab = counter.val(); }
/// clear given label's value (independent of a labeller)
static void clear ( LabelType& lab ) { lab = 0; }
/// check if given label is labelled
bool isLabelled ( const LabelType& lab ) const { return (lab == counter.val()); }
}; // TLabeller
#endif
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