libstdc++-v3/testsuite/ext/random/uniform_inside_sphere_distribution/operators/generate.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-cstdint "" }
   3 //
   4 // Copyright (C) 2014-2019 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 along
  18 // with this library; see the file COPYING3.  If not see
  19 // <http://www.gnu.org/licenses/>.
  20
  21 // Class template uniform_inside_sphere_distribution
  22 // 26.5.1.6 Random number distribution requirements [rand.req.dist]
  23
  24 #include <ext/random>
  25 #include <sstream>
  26 #include <testsuite_hooks.h>
  27
  28 void
  29 test01()
  30 {
  31   bool test [[gnu::unused]] = true;
  32   std::minstd_rand0 rng;
  33
  34   __gnu_cxx::uniform_inside_sphere_distribution<3> u3(2.0);
  35
  36   for (size_t n = 0; n < 1000; ++n)
  37     {
  38       auto r = u3(rng);
  39
  40       VERIFY (std::abs(r[0]) < 2.0
  41            && std::abs(r[1]) < 2.0
  42            && std::abs(r[2]) < 2.0);
  43     }
  44
  45   __gnu_cxx::uniform_inside_sphere_distribution<2> u2(4000.0);
  46
  47   for (size_t n = 0; n < 1000; ++n)
  48     {
  49       auto r = u2(rng);
  50
  51       VERIFY (std::abs(r[0]) < 4000.0 && std::abs(r[1]) < 4000.0);
  52     }
  53 }
  54
  55 int
  56 main()
  57 {
  58   test01();
  59   return 0;
  60 }