1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // <random>
10
11 // template<class RealType = double>
12 // class piecewise_linear_distribution
13
14 // template<class UnaryOperation>
15 // param_type(size_t nw, double xmin, double xmax,
16 // UnaryOperation fw);
17
18 #include <random>
19 #include <cassert>
20
21 #include "test_macros.h"
22
fw(double x)23 double fw(double x)
24 {
25 return 2*x;
26 }
27
main(int,char **)28 int main(int, char**)
29 {
30 {
31 typedef std::piecewise_linear_distribution<> D;
32 typedef D::param_type P;
33 P pa(0, 0, 1, fw);
34 std::vector<double> iv = pa.intervals();
35 assert(iv.size() == 2);
36 assert(iv[0] == 0);
37 assert(iv[1] == 1);
38 std::vector<double> dn = pa.densities();
39 assert(dn.size() == 2);
40 assert(dn[0] == 0);
41 assert(dn[1] == 2);
42 }
43 {
44 typedef std::piecewise_linear_distribution<> D;
45 typedef D::param_type P;
46 P pa(1, 10, 12, fw);
47 std::vector<double> iv = pa.intervals();
48 assert(iv.size() == 2);
49 assert(iv[0] == 10);
50 assert(iv[1] == 12);
51 std::vector<double> dn = pa.densities();
52 assert(dn.size() == 2);
53 assert(dn[0] == 20./44);
54 assert(dn[1] == 24./44);
55 }
56 {
57 typedef std::piecewise_linear_distribution<> D;
58 typedef D::param_type P;
59 P pa(2, 6, 14, fw);
60 std::vector<double> iv = pa.intervals();
61 assert(iv.size() == 3);
62 assert(iv[0] == 6);
63 assert(iv[1] == 10);
64 assert(iv[2] == 14);
65 std::vector<double> dn = pa.densities();
66 assert(dn.size() == 3);
67 assert(dn[0] == 0.075);
68 assert(dn[1] == 0.125);
69 assert(dn[2] == 0.175);
70 }
71
72 return 0;
73 }
74