1// { dg-options "-std=gnu++11" } 2// { dg-require-cstdint "" } 3// 4// 2008-12-03 Edward M. Smith-Rowland <3dw4rd@verizon.net> 5// 6// Copyright (C) 2008-2015 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 <cmath> 28#include <testsuite_hooks.h> 29 30struct cosine_distribution 31{ 32 cosine_distribution(double x0, double lambda) 33 : _M_x0(x0), _M_lambda(lambda) 34 { } 35 36 double 37 operator()(double x) 38 { 39 if (x - _M_x0 < -_M_lambda / 4) 40 return 0.0; 41 else if (x - _M_x0 > _M_lambda / 4) 42 return 0.0; 43 else 44 { 45 const double pi = 3.14159265358979323846; 46 return std::cos(2 * pi * (x - _M_x0) / _M_lambda); 47 } 48 } 49 50private: 51 double _M_x0; 52 double _M_lambda; 53}; 54 55void 56test01() 57{ 58 bool test __attribute__((unused)) = true; 59 60 cosine_distribution cd(1.5, 3.0); 61 std::discrete_distribution<> u(21, -10.0, 10.0, cd); 62 std::vector<double> probablility = u.probabilities(); 63 VERIFY( probablility.size() == 21 ); 64} 65 66int main() 67{ 68 test01(); 69 return 0; 70} 71