libstdc++-v3/testsuite/20_util/ratio/operations/47913.cc

   1 // { dg-do run { target c++11 } }
   2
   3 // Copyright (C) 2011-2019 Free Software Foundation, Inc.
   4 //
   5 // This file is part of the GNU ISO C++ Library.  This library is free
   6 // software; you can redistribute it and/or modify it under the
   7 // terms of the GNU General Public License as published by the
   8 // Free Software Foundation; either version 3, or (at your option)
   9 // any later version.
  10
  11 // This library is distributed in the hope that it will be useful,
  12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 // GNU General Public License for more details.
  15
  16 // You should have received a copy of the GNU General Public License
  17 // along with this library; see the file COPYING3.  If not see
  18 // <http://www.gnu.org/licenses/>.
  19
  20 #include <ratio>
  21 #include <limits>
  22 #include <testsuite_hooks.h>
  23
  24 // libstdc++/47913
  25 void test01()
  26 {
  27   using namespace std;
  28
  29   const intmax_t m1 = (intmax_t)1 << (4 * sizeof(intmax_t) - 1);
  30   typedef ratio_add<ratio<1, (m1 - 1) * (m1 - 2)>,
  31                     ratio<1, (m1 - 3) * (m1 - 2)> > ra_type1;
  32   VERIFY( ra_type1::num == 2 );
  33   VERIFY( ra_type1::den == (m1 - 1) * (m1 - 3) );
  34
  35   const intmax_t m2 = numeric_limits<intmax_t>::max();
  36   typedef ratio_add<ratio<m2, 2>,
  37                     ratio<-m2, 3> > ra_type2;
  38   VERIFY( ra_type2::num == m2 );
  39   VERIFY( ra_type2::den == 6 );
  40
  41   typedef ratio_add<ratio<m2 / 7 * 5 - 1, 5>,
  42                     ratio<-m2 + 2, 7> > ra_type3;
  43   ra_type3();
  44
  45   const intmax_t m3 = numeric_limits<intmax_t>::max() - 1;
  46   typedef ratio_add<ratio<-m3 / 7 * 5 - 1, 5>,
  47                     ratio<m3, 7> > ra_type4;
  48   ra_type4();
  49
  50   const intmax_t m4 = numeric_limits<intmax_t>::max() / 2;
  51   typedef ratio_add<ratio<m4 - 5, 15>,
  52                     ratio<m4, 35> > ra_type5;
  53   VERIFY( ra_type5::num == (2 * m4 - 7) );
  54   VERIFY( ra_type5::den == 21 );
  55 }
  56
  57 int main()
  58 {
  59   test01();
  60   return 0;
  61 }