src/base/utils/number.cpp

   1 /*
   2  * Bittorrent Client using Qt and libtorrent.
   3  * Copyright (C) 2024  Mike Tzou (Chocobo1)
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18  *
  19  * In addition, as a special exception, the copyright holders give permission to
  20  * link this program with the OpenSSL project's "OpenSSL" library (or with
  21  * modified versions of it that use the same license as the "OpenSSL" library),
  22  * and distribute the linked executables. You must obey the GNU General Public
  23  * License in all respects for all of the code used other than "OpenSSL".  If you
  24  * modify file(s), you may extend this exception to your version of the file(s),
  25  * but you are not obligated to do so. If you do not wish to do so, delete this
  26  * exception statement from your version.
  27  */
  28
  29 #include "number.h"
  30
  31 #include <algorithm>
  32 #include <cstdint>
  33 #include <limits>
  34
  35 int Utils::Number::clampingAdd(const int num1, const int num2)
  36 {
  37     static_assert(sizeof(int64_t) > sizeof(int));
  38
  39     const int64_t intMin = std::numeric_limits<int>::min();
  40     const int64_t intMax = std::numeric_limits<int>::max();
  41     const int64_t sumResult = static_cast<int64_t>(num1) + num2;
  42     const int64_t clampedValue = std::clamp(sumResult, intMin, intMax);
  43     return static_cast<int>(clampedValue);
  44 }