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6112b14e | 1 | // { dg-options "-std=gnu++11" } |
25dd15fe | 2 | // { dg-require-cstdint "" } |
fca66f47 | 3 | // |
4 | // 2008-12-03 Edward M. Smith-Rowland <3dw4rd@verizon.net> | |
5 | // | |
f1717362 | 6 | // Copyright (C) 2008-2016 Free Software Foundation, Inc. |
fca66f47 | 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 | |
6bc9506f | 11 | // Free Software Foundation; either version 3, or (at your option) |
fca66f47 | 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 | |
6bc9506f | 20 | // with this library; see the file COPYING3. If not see |
21 | // <http://www.gnu.org/licenses/>. | |
fca66f47 | 22 | |
e9e5970b | 23 | // 26.4.8.5.2 Class template piecewise_constant_distribution |
24 | // [rand.dist.samp.pconst] | |
fca66f47 | 25 | // 26.4.2.4 Concept RandomNumberDistribution [rand.concept.dist] |
26 | ||
27 | #include <random> | |
28 | #include <cmath> | |
29 | #include <testsuite_hooks.h> | |
30 | ||
31 | struct cosine_distribution | |
32 | { | |
33 | cosine_distribution(double x0, double lambda) | |
34 | : _M_x0(x0), _M_lambda(lambda) | |
35 | { } | |
36 | ||
37 | double | |
38 | operator()(double x) | |
39 | { | |
40 | if (x - _M_x0 < -_M_lambda / 4) | |
41 | return 0.0; | |
42 | else if (x - _M_x0 > _M_lambda / 4) | |
43 | return 0.0; | |
e9e5970b | 44 | else |
45 | { | |
46 | const double pi = 3.14159265358979323846; | |
47 | return std::cos(2 * pi * (x - _M_x0) / _M_lambda); | |
48 | } | |
fca66f47 | 49 | } |
50 | ||
51 | private: | |
52 | double _M_x0; | |
53 | double _M_lambda; | |
54 | }; | |
55 | ||
56 | void | |
57 | test01() | |
58 | { | |
59 | bool test __attribute__((unused)) = true; | |
60 | ||
61 | cosine_distribution cd(1.5, 3.0); | |
62 | std::piecewise_constant_distribution<> u({-10.0, -8.0, -6.0, -4.0, -2.0, | |
63 | 0.0, 2.0, 4.0, 6.0, 8.0, 10.0}, | |
64 | cd); | |
65 | std::vector<double> interval = u.intervals(); | |
66 | std::vector<double> density = u.densities(); | |
67 | VERIFY( interval.size() == 11 ); | |
68 | VERIFY( density.size() == 10 ); | |
69 | } | |
70 | ||
71 | int main() | |
72 | { | |
73 | test01(); | |
74 | return 0; | |
75 | } |