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   // No overflow with same denominator
  30   VERIFY( (std::ratio_less<std::ratio<M - 2, M>,
  31            std::ratio<M - 1, M>>::value == 1) );
  32
  33   VERIFY( (std::ratio_less<std::ratio<M - 1, M>,
  34            std::ratio<M - 2, M>>::value == 0) );
  35
  36   // No overflow if signs differ
  37   VERIFY( (std::ratio_less<std::ratio<-M, M - 1>,
  38            std::ratio<M - 1, M - 2>>::value == 1) );
  39
  40   VERIFY( (std::ratio_less<std::ratio<M - 1, M - 2>,
  41            std::ratio<-M, M - 1>>::value == 0) );
  42
  43   // No overflow
  44   VERIFY( (std::ratio_less<std::ratio<M, M - 1>,
  45            std::ratio<M, M - 2>>::value == 1) );
  46
  47   VERIFY( (std::ratio_less<std::ratio<-M, M - 1>,
  48            std::ratio<-M, M - 2>>::value == 0) );
  49
  50   VERIFY( (std::ratio_less<std::ratio<M - 2, M - 1>,
  51            std::ratio<M - 1, M>>::value == 1) );
  52 }
  53
  54 int main()
  55 {
  56   test01();
  57   return 0;
  58 }