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

   1 // { dg-options "-std=c++0x" }
   2 //
   3 // 2008-12-03  Edward M. Smith-Rowland <3dw4rd@verizon.net>
   4 //
   5 // Copyright (C) 2008 Free Software Foundation, Inc.
   6 //
   7 // This file is part of the GNU ISO C++ Library.  This library is free
   8 // software; you can redistribute it and/or modify it under the
   9 // terms of the GNU General Public License as published by the
  10 // Free Software Foundation; either version 2, or (at your option)
  11 // any later version.
  12 //
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 // GNU General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU General Public License along
  19 // with this library; see the file COPYING.  If not, write to the Free
  20 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
  21 // USA.
  22
  23 // 26.4.8.5.2 Class template piecewise_constant_distribution [rand.dist.samp.pconst]
  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   bool test __attribute__((unused)) = true;
  33
  34   std::vector<double> x = {0.0, 1.0, 2.0, 3.0, 4.0, 5.0};
  35   std::vector<double> wt = {0.5, 1.0, 2.5, 1.5, 0.5};
  36   std::piecewise_constant_distribution<> u(x.begin(), x.end(), wt.begin());
  37   std::vector<double> interval = u.intervals();
  38   std::vector<double> density = u.densities();
  39   VERIFY( interval.size() == 6 );
  40   VERIFY( interval[0] == 0.0 );
  41   VERIFY( interval[5] == 5.0 );
  42   VERIFY( density.size() == 5 );
  43   VERIFY( density[0] == 0.5 / 6.0 );
  44   VERIFY( density[2] == 2.5 / 6.0 );
  45 }
  46
  47 int main()
  48 {
  49   test01();
  50   return 0;
  51 }