libstdc++-v3/testsuite/26_numerics/random/uniform_real_distribution/operators/64351.cc

   1 // Copyright (C) 2015-2018 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 run { target { c++11 && { ! simulator } } } }
  19
  20 #include <random>
  21 #include <testsuite_hooks.h>
  22
  23 // libstdc++/64351
  24 void
  25 test01()
  26 {
  27   std::mt19937 rng(8890);
  28   std::uniform_real_distribution<float> dist;
  29
  30   rng.discard(30e6);
  31   for (long i = 0; i < 10e6; ++i)
  32     {
  33       auto n = dist(rng);
  34       VERIFY( n != 1.f );
  35     }
  36 }
  37
  38 // libstdc++/63176
  39 void
  40 test02()
  41 {
  42   std::mt19937 rng(8890);
  43   std::seed_seq sequence{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
  44   rng.seed(sequence);
  45   rng.discard(12 * 629143);
  46   std::mt19937 rng2{rng};
  47   for (int i = 0; i < 20; ++i)
  48   {
  49     float n =
  50       std::generate_canonical<float, std::numeric_limits<float>::digits>(rng);
  51     VERIFY( n != 1.f );
  52
  53     // PR libstdc++/80137
  54     rng2.discard(1);
  55     VERIFY( rng == rng2 );
  56   }
  57 }
  58
  59 int
  60 main()
  61 {
  62   test01();
  63   test02();
  64 }