libstdc++-v3/testsuite/26_numerics/random/random_device/85494.cc

   1 // Copyright (C) 2019-2021 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 } }
  19 // { dg-require-effective-target random_device }
  20
  21 #include <random>
  22 #include <testsuite_hooks.h>
  23
  24 void
  25 test01()
  26 {
  27   unsigned v1[3], v2[3];
  28   std::random_device d1, d2;
  29   for (auto& v : v1)
  30     v = d1();
  31   for (auto& v : v2)
  32     v = d2();
  33   VERIFY (v1[0] != v2[0] || v1[1] != v2[1] || v1[2] != v2[2] );
  34 }
  35
  36 int
  37 main()
  38 {
  39   test01();
  40 }