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// UNSUPPORTED: c++03
10
11// <random>
12
13// template<class RealType = double>
14// class piecewise_constant_distribution
15
16// param_type(initializer_list<result_type> bl, UnaryOperation fw);
17
18#include <random>
19
20#include <cassert>
21#include <vector>
22
23#include "test_macros.h"
24
25double f(double x)
26{
27 return x*2;
28}
29
30int main(int, char**)
31{
32 {
33 typedef std::piecewise_constant_distribution<> D;
34 typedef D::param_type P;
35 P pa({}, f);
36 std::vector<double> iv = pa.intervals();
37 assert(iv.size() == 2);
38 assert(iv[0] == 0);
39 assert(iv[1] == 1);
40 std::vector<double> dn = pa.densities();
41 assert(dn.size() == 1);
42 assert(dn[0] == 1);
43 }
44 {
45 typedef std::piecewise_constant_distribution<> D;
46 typedef D::param_type P;
47 P pa({12}, f);
48 std::vector<double> iv = pa.intervals();
49 assert(iv.size() == 2);
50 assert(iv[0] == 0);
51 assert(iv[1] == 1);
52 std::vector<double> dn = pa.densities();
53 assert(dn.size() == 1);
54 assert(dn[0] == 1);
55 }
56 {
57 typedef std::piecewise_constant_distribution<> D;
58 typedef D::param_type P;
59 P pa({12, 14}, f);
60 std::vector<double> iv = pa.intervals();
61 assert(iv.size() == 2);
62 assert(iv[0] == 12);
63 assert(iv[1] == 14);
64 std::vector<double> dn = pa.densities();
65 assert(dn.size() == 1);
66 assert(dn[0] == 0.5);
67 }
68 {
69 typedef std::piecewise_constant_distribution<> D;
70 typedef D::param_type P;
71 P pa({5.5, 7.5, 11.5}, f);
72 std::vector<double> iv = pa.intervals();
73 assert(iv.size() == 3);
74 assert(iv[0] == 5.5);
75 assert(iv[1] == 7.5);
76 assert(iv[2] == 11.5);
77 std::vector<double> dn = pa.densities();
78 assert(dn.size() == 2);
79 assert(dn[0] == 0.203125);
80 assert(dn[1] == 0.1484375);
81 }
82
83 return 0;
84}
85

source code of libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.pconst/param_ctor_init_func.pass.cpp