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

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-cstdint "" }
   3 //
   4 // 2014-08-09  Ulrich Drepper  <drepper@gmail.com>
   5 //
   6 // Copyright (C) 2014-2020 Free Software Foundation, Inc.
   7 //
   8 // This file is part of the GNU ISO C++ Library.  This library is free
   9 // software; you can redistribute it and/or modify it under the
  10 // terms of the GNU General Public License as published by the
  11 // Free Software Foundation; either version 3, or (at your option)
  12 // any later version.
  13 //
  14 // This library is distributed in the hope that it will be useful,
  15 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 // GNU General Public License for more details.
  18 //
  19 // You should have received a copy of the GNU General Public License along
  20 // with this library; see the file COPYING3.  If not see
  21 // <http://www.gnu.org/licenses/>.
  22
  23 // Class template uniform_on_sphere_distribution
  24 // 26.5.1.6 Random number distribution requirements [rand.req.dist]
  25
  26 #include <ext/random>
  27 #include <sstream>
  28 #include <testsuite_hooks.h>
  29
  30 void
  31 test01()
  32 {
  33   std::minstd_rand0 rng;
  34
  35   __gnu_cxx::uniform_on_sphere_distribution<3> u3;
  36
  37   for (size_t n = 0; n < 1000; ++n)
  38     {
  39       auto r = u3(rng);
  40
  41       VERIFY (r[0] != 0.0 || r[1] != 0.0 || r[2] != 0.0);
  42     }
  43
  44   __gnu_cxx::uniform_on_sphere_distribution<2> u2;
  45
  46   for (size_t n = 0; n < 1000; ++n)
  47     {
  48       auto r = u2(rng);
  49
  50       VERIFY (r[0] != 0.0 || r[1] != 0.0);
  51     }
  52 }
  53
  54 int
  55 main()
  56 {
  57   test01();
  58   return 0;
  59 }