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new class helping to compute the size of mapping array from size of the solution and number of positions to change

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git-svn-id: svn://scm.gforge.inria.fr/svnroot/paradiseo@2292 331e1502-861f-0410-8da2-ba01fb791d7f
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boufaras 2011-07-06 13:46:36 +00:00
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trunk/paradiseo-mo/src/neighborhood/moNeighborhoodSizeUtils.h Executable file
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/*
<moNeighborhoodSizeUtils.h>
Copyright (C) DOLPHIN Project-Team, INRIA Lille - Nord Europe, 2006-2010
Karima Boufaras, Thé Van LUONG
This software is governed by the CeCILL license under French law and
abiding by the rules of distribution of free software. You can use,
modify and/ or redistribute the software under the terms of the CeCILL
license as circulated by CEA, CNRS and INRIA at the following URL
"http://www.cecill.info".
As a counterpart to the access to the source code and rights to copy,
modify and redistribute granted by the license, users are provided only
with a limited warranty and the software's author, the holder of the
economic rights, and the successive licensors have only limited liability.
In this respect, the user's attention is drawn to the risks associated
with loading, using, modifying and/or developing or reproducing the
software by the user in light of its specific status of free software,
that may mean that it is complicated to manipulate, and that also
therefore means that it is reserved for developers and experienced
professionals having in-depth computer knowledge. Users are therefore
encouraged to load and test the software's suitability as regards their
requirements in conditions enabling the security of their systems and/or
data to be ensured and, more generally, to use and operate it in the
same conditions as regards security.
The fact that you are presently reading this means that you have had
knowledge of the CeCILL license and that you accept its terms.
ParadisEO WebSite : http://paradiseo.gforge.inria.fr
Contact: paradiseo-help@lists.gforge.inria.fr
*/
#ifndef _moNeighborhoodSizeUtils_h
#define _moNeighborhoodSizeUtils_h
/**
* @return the factorial of an integer
* @param _i an integer
*/
static int factorial(int _i) {
if (_i == 0)
return 1;
else
return _i * factorial(_i - 1);
}
/**
* @return the neighborhood Size from the solution size and the exchange distance
* @param _n the solution size
* @param _xChange the number of positions to change
*/
static int sizeMapping(int _n, unsigned int _xChange) {
int _sizeMapping = _n;
for (int i = _xChange-1; i > 0; i--) {
_sizeMapping *= (_n - i);
}
_sizeMapping /= factorial(_xChange);
return _sizeMapping;
}
#endif