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/**************************************************************************
* *
* Regina - A Normal Surface Theory Calculator *
* Computational Engine *
* *
* Copyright (c) 1999-2009, Ben Burton *
* For further details contact Ben Burton (bab@debian.org). *
* *
* This program is free software; you can redistribute it and/or *
* modify it under the terms of the GNU General Public License as *
* published by the Free Software Foundation; either version 2 of the *
* License, or (at your option) any later version. *
* *
* This program 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 *
* General Public License for more details. *
* *
* You should have received a copy of the GNU General Public *
* License along with this program; if not, write to the Free *
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, *
* MA 02110-1301, USA. *
* *
**************************************************************************/
/* end stub */
#include "triangulation/nfacepair.h"
namespace regina {
NFacePair::NFacePair(int newFirst, int newSecond) {
if (newFirst < newSecond) {
first = newFirst;
second = newSecond;
} else {
first = newSecond;
second = newFirst;
}
}
NFacePair NFacePair::complement() const {
if (first > 1)
return NFacePair(0, 1);
else if (first == 1)
return (second == 2 ? NFacePair(0, 3) : NFacePair(0, 2));
else if (second == 1)
return NFacePair(2, 3);
else if (second == 2)
return NFacePair(1, 3);
else
return NFacePair(1, 2);
}
void NFacePair::operator ++ (int) {
if (second < 3)
second++;
else if (first < 3) {
first++;
if (first < 3)
second = first + 1;
}
}
void NFacePair::operator -- (int) {
if (second > first + 1)
second--;
else if (first > 0) {
first--;
second = 3;
} else
second = 0;
}
} // namespace regina
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