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/**************************************************************************
* *
* Regina - A Normal Surface Theory Calculator *
* Computational Engine *
* *
* Copyright (c) 1999-2025, 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. *
* *
* As an exception, when this program is distributed through (i) the *
* App Store by Apple Inc.; (ii) the Mac App Store by Apple Inc.; or *
* (iii) Google Play by Google Inc., then that store may impose any *
* digital rights management, device limits and/or redistribution *
* restrictions that are required by its terms of service. *
* *
* 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, see <https://www.gnu.org/licenses/>. *
* *
**************************************************************************/
#include "triangulation/facepair.h"
namespace regina {
FacePair& FacePair::operator ++ () {
// Codes: 0, 1, 2, 3, 6, 7, 11, 15.
if (code_ < 3 || code_ == 6) // alt test: code & 3 != 3
++code_;
else if (code_ > 6) // alt test: code & 12 != 0
code_ += 4;
else
code_ = 6;
return *this;
}
FacePair& FacePair::operator -- () {
// Codes: 0, 1, 2, 3, 6, 7, 11, 15.
if (code_ < 6 || code_ == 7)
--code_;
else if (code_ > 7)
code_ -= 4;
else
code_ = 3;
return *this;
}
} // namespace regina
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