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// discrete_distribution(size_t nw, double xmin, double xmax,
16// UnaryOperation fw);
17
18// There is a bogus diagnostic about a too large allocation
19// ADDITIONAL_COMPILE_FLAGS(gcc): -Wno-alloc-size-larger-than
20
21#include <random>
22
23#include <cassert>
24#include <vector>
25
26#include "test_macros.h"
27
28double fw(double x)
29{
30 return x+1;
31}
32
33int main(int, char**)
34{
35 {
36 typedef std::discrete_distribution<> D;
37 D d(0, 0, 1, fw);
38 std::vector<double> p = d.probabilities();
39 assert(p.size() == 1);
40 assert(p[0] == 1);
41 }
42 {
43 typedef std::discrete_distribution<> D;
44 D d(1, 0, 1, fw);
45 std::vector<double> p = d.probabilities();
46 assert(p.size() == 1);
47 assert(p[0] == 1);
48 }
49 {
50 typedef std::discrete_distribution<> D;
51 D d(2, 0.5, 1.5, fw);
52 std::vector<double> p = d.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 D d(4, 0, 2, fw);
60 std::vector<double> p = d.probabilities();
61 assert(p.size() == 4);
62 assert(p[0] == .15625);
63 assert(p[1] == .21875);
64 assert(p[2] == .28125);
65 }
66
67 return 0;
68}
69

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