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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libstdc++-v3/testsuite/26_numerics/random/piecewise_constant_distribution/cons/initlist_fun.cc | |
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Diffstat (limited to 'libstdc++-v3/testsuite/26_numerics/random/piecewise_constant_distribution/cons/initlist_fun.cc')
-rw-r--r-- | libstdc++-v3/testsuite/26_numerics/random/piecewise_constant_distribution/cons/initlist_fun.cc | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/libstdc++-v3/testsuite/26_numerics/random/piecewise_constant_distribution/cons/initlist_fun.cc b/libstdc++-v3/testsuite/26_numerics/random/piecewise_constant_distribution/cons/initlist_fun.cc new file mode 100644 index 000000000..7ae5d89be --- /dev/null +++ b/libstdc++-v3/testsuite/26_numerics/random/piecewise_constant_distribution/cons/initlist_fun.cc @@ -0,0 +1,75 @@ +// { dg-options "-std=c++0x" } +// { dg-require-cstdint "" } +// +// 2008-12-03 Edward M. Smith-Rowland <3dw4rd@verizon.net> +// +// Copyright (C) 2008, 2009 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/>. + +// 26.4.8.5.2 Class template piecewise_constant_distribution +// [rand.dist.samp.pconst] +// 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_constant_distribution<> u({-10.0, -8.0, -6.0, -4.0, -2.0, + 0.0, 2.0, 4.0, 6.0, 8.0, 10.0}, + cd); + std::vector<double> interval = u.intervals(); + std::vector<double> density = u.densities(); + VERIFY( interval.size() == 11 ); + VERIFY( density.size() == 10 ); +} + +int main() +{ + test01(); + return 0; +} |