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 // { dg-require-cstdint "" }
  20
  21 #include <random>
  22 #include <testsuite_hooks.h>
  23
  24 // libstdc++/64351
  25 void
  26 test01()
  27 {
  28   std::mt19937 rng(8890);
  29   std::uniform_real_distribution<float> dist;
  30
  31   rng.discard(30e6);
  32   for (long i = 0; i < 10e6; ++i)
  33     {
  34       auto n = dist(rng);
  35       VERIFY( n != 1.f );
  36     }
  37 }
  38
  39 // libstdc++/63176
  40 void
  41 test02()
  42 {
  43   std::mt19937 rng(8890);
  44   std::seed_seq sequence{0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
  45   rng.seed(sequence);
  46   rng.discard(12 * 629143);
  47   std::mt19937 rng2{rng};
  48   for (int i = 0; i < 20; ++i)
  49   {
  50     float n =
  51       std::generate_canonical<float, std::numeric_limits<float>::digits>(rng);
  52     VERIFY( n != 1.f );
  53
  54     // PR libstdc++/80137
  55     rng2.discard(1);
  56     VERIFY( rng == rng2 );
  57   }
  58 }
  59
  60 int
  61 main()
  62 {
  63   test01();
  64   test02();
  65 }