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 IntType = int>
12// class discrete_distribution
13
14// template<class UnaryOperation>
15// param_type(size_t nw, double xmin, double xmax,
16// 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 x+1;
28}
29
30int main(int, char**)
31{
32 {
33 typedef std::discrete_distribution<> D;
34 typedef D::param_type P;
35 P pa(0, 0, 1, fw);
36 std::vector<double> p = pa.probabilities();
37 assert(p.size() == 1);
38 assert(p[0] == 1);
39 }
40 {
41 typedef std::discrete_distribution<> D;
42 typedef D::param_type P;
43 P pa(1, 0, 1, fw);
44 std::vector<double> p = pa.probabilities();
45 assert(p.size() == 1);
46 assert(p[0] == 1);
47 }
48 {
49 typedef std::discrete_distribution<> D;
50 typedef D::param_type P;
51 P pa(2, 0.5, 1.5, fw);
52 std::vector<double> p = pa.probabilities();
53 assert(p.size() == 2);
54 assert(p[0] == .4375);
55 assert(p[1] == .5625);
56 }
57 {
58 typedef std::discrete_distribution<> D;
59 typedef D::param_type P;
60 P pa(4, 0, 2, fw);
61 std::vector<double> p = pa.probabilities();
62 assert(p.size() == 4);
63 assert(p[0] == .15625);
64 assert(p[1] == .21875);
65 assert(p[2] == .28125);
66 }
67
68 return 0;
69}
70

source code of libcxx/test/std/numerics/rand/rand.dist/rand.dist.samp/rand.dist.samp.discrete/param_ctor_func.pass.cpp