libstdc++-v3/testsuite/26_numerics/random/discrete_distribution/cons/range.cc

   1 // { dg-do run { target c++11 } }
   2 // { dg-require-cstdint "" }
   3 //
   4 // 2008-12-03  Edward M. Smith-Rowland <3dw4rd@verizon.net>
   5 //
   6 // Copyright (C) 2008-2019 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 // 26.4.8.5.1 Class template discrete_distribution [rand.dist.samp.discrete]
  24 // 26.4.2.4 Concept RandomNumberDistribution [rand.concept.dist]
  25
  26 #include <random>
  27 #include <testsuite_hooks.h>
  28
  29 void
  30 test01()
  31 {
  32   std::vector<double> wt = {0.5, 1.0, 2.5, 1.5, 0.5};
  33   std::discrete_distribution<> u(wt.begin(), wt.end());
  34   std::vector<double> probablility = u.probabilities();
  35   VERIFY( probablility.size() == 5 );
  36   VERIFY( probablility[0] == 0.5 / 6.0 );
  37   VERIFY( probablility[2] == 2.5 / 6.0 );
  38 }
  39
  40 int main()
  41 {
  42   test01();
  43   return 0;
  44 }