| // { dg-options "-std=c++0x" } |
| // { dg-require-cstdint "" } |
| // |
| // 2008-12-03 Edward M. Smith-Rowland <3dw4rd@verizon.net> |
| // |
| // Copyright (C) 2008-2013 Free Software Foundation, Inc. |
| // |
| // This file is part of the GNU ISO C++ Library. This library is free |
| // software; you can redistribute it and/or modify it under the |
| // terms of the GNU General Public License as published by the |
| // Free Software Foundation; either version 3, or (at your option) |
| // any later version. |
| // |
| // This library is distributed in the hope that it will be useful, |
| // but WITHOUT ANY WARRANTY; without even the implied warranty of |
| // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| // GNU General Public License for more details. |
| // |
| // You should have received a copy of the GNU General Public License along |
| // with this library; see the file COPYING3. If not see |
| // <http://www.gnu.org/licenses/>. |
| |
| // 26.4.8.5.3 Class template piecewise_linear_distribution |
| // [rand.dist.samp.plinear] |
| // 26.4.2.4 Concept RandomNumberDistribution [rand.concept.dist] |
| |
| #include <random> |
| #include <cmath> |
| #include <testsuite_hooks.h> |
| |
| struct cosine_distribution |
| { |
| cosine_distribution(double x0, double lambda) |
| : _M_x0(x0), _M_lambda(lambda) |
| { } |
| |
| double |
| operator()(double x) |
| { |
| if (x - _M_x0 < -_M_lambda / 4) |
| return 0.0; |
| else if (x - _M_x0 > _M_lambda / 4) |
| return 0.0; |
| else |
| { |
| const double pi = 3.14159265358979323846; |
| return std::cos(2 * pi * (x - _M_x0) / _M_lambda); |
| } |
| } |
| |
| private: |
| double _M_x0; |
| double _M_lambda; |
| }; |
| |
| void |
| test01() |
| { |
| bool test __attribute__((unused)) = true; |
| |
| cosine_distribution cd(1.5, 3.0); |
| std::piecewise_linear_distribution<> u(21, -10.0, 10.0, cd); |
| std::vector<double> interval = u.intervals(); |
| std::vector<double> density = u.densities(); |
| VERIFY( interval.size() == 22 ); |
| VERIFY( density.size() == 22 ); |
| } |
| |
| int main() |
| { |
| test01(); |
| return 0; |
| } |