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// piecewise_linear_distribution(size_t nw, result_type xmin,
16// result_type xmax, UnaryOperation fw);
17
18#include <random>
19
20#include <cassert>
21#include <vector>
22
23#include "test_macros.h"
24
25double fw(double x)
26{
27 return 2*x;
28}
29
30int main(int, char**)
31{
32 {
33 typedef std::piecewise_linear_distribution<> D;
34 D d(0, 0, 1, fw);
35 std::vector<double> iv = d.intervals();
36 assert(iv.size() == 2);
37 assert(iv[0] == 0);
38 assert(iv[1] == 1);
39 std::vector<double> dn = d.densities();
40 assert(dn.size() == 2);
41 assert(dn[0] == 0);
42 assert(dn[1] == 2);
43 }
44 {
45 typedef std::piecewise_linear_distribution<> D;
46 D d(1, 10, 12, fw);
47 std::vector<double> iv = d.intervals();
48 assert(iv.size() == 2);
49 assert(iv[0] == 10);
50 assert(iv[1] == 12);
51 std::vector<double> dn = d.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 D d(2, 6, 14, fw);
59 std::vector<double> iv = d.intervals();
60 assert(iv.size() == 3);
61 assert(iv[0] == 6);
62 assert(iv[1] == 10);
63 assert(iv[2] == 14);
64 std::vector<double> dn = d.densities();
65 assert(dn.size() == 3);
66 assert(dn[0] == 0.075);
67 assert(dn[1] == 0.125);
68 assert(dn[2] == 0.175);
69 }
70
71 return 0;
72}
73

source code of libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.plinear/ctor_func.pass.cpp