libstdc++-v3/testsuite/26_numerics/gcd/92978.cc

   1 // Copyright (C) 2020-2021 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-do compile { target c++17 } }
  19
  20 #include <numeric>
  21 #include <limits.h>
  22
  23 void
  24 test01()
  25 {
  26   // PR libstdc++/92978
  27   static_assert( std::gcd(-120, 10U) == 10 );
  28   static_assert( std::gcd(120U, -10) == 10 );
  29 }
  30
  31 void
  32 test02()
  33 {
  34   // |INT_MIN| should not be undefined, as long as it fits in the result type.
  35   static_assert( std::gcd(INT_MIN, 0LL) == 1LL+INT_MAX );
  36   static_assert( std::gcd(0LL, INT_MIN) == 1LL+INT_MAX );
  37   static_assert( std::gcd(INT_MIN, 0LL + INT_MIN) == 1LL + INT_MAX );
  38   static_assert( std::gcd(INT_MIN, 1LL + INT_MAX) == 1LL + INT_MAX );
  39   static_assert( std::gcd(SHRT_MIN, 1U + SHRT_MAX) == 1U + SHRT_MAX );
  40 }