libstdc++-v3/testsuite/20_util/ratio/comparisons/comp2.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-cstdint "" }
   3
   4 // Copyright (C) 2008-2016 Free Software Foundation, Inc.
   5 //
   6 // This file is part of the GNU ISO C++ Library.  This library is free
   7 // software; you can redistribute it and/or modify it under the
   8 // terms of the GNU General Public License as published by the
   9 // Free Software Foundation; either version 3, or (at your option)
  10 // any later version.
  11
  12 // This library is distributed in the hope that it will be useful,
  13 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 // GNU General Public License for more details.
  16
  17 // You should have received a copy of the GNU General Public License
  18 // along with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 #include <ratio>
  22 #include <testsuite_hooks.h>
  23
  24 static const std::intmax_t M = INTMAX_MAX;
  25
  26 void
  27 test01()
  28 {
  29   bool test __attribute__((unused)) = true;
  30
  31   // No overflow with same denominator
  32   VERIFY( (std::ratio_less<std::ratio<M - 2, M>,
  33            std::ratio<M - 1, M>>::value == 1) );
  34
  35   VERIFY( (std::ratio_less<std::ratio<M - 1, M>,
  36            std::ratio<M - 2, M>>::value == 0) );
  37
  38   // No overflow if signs differ
  39   VERIFY( (std::ratio_less<std::ratio<-M, M - 1>,
  40            std::ratio<M - 1, M - 2>>::value == 1) );
  41
  42   VERIFY( (std::ratio_less<std::ratio<M - 1, M - 2>,
  43            std::ratio<-M, M - 1>>::value == 0) );
  44
  45   // No overflow
  46   VERIFY( (std::ratio_less<std::ratio<M, M - 1>,
  47            std::ratio<M, M - 2>>::value == 1) );
  48
  49   VERIFY( (std::ratio_less<std::ratio<-M, M - 1>,
  50            std::ratio<-M, M - 2>>::value == 0) );
  51
  52   VERIFY( (std::ratio_less<std::ratio<M - 2, M - 1>,
  53            std::ratio<M - 1, M>>::value == 1) );
  54 }
  55
  56 int main()
  57 {
  58   test01();
  59   return 0;
  60 }