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 #include <random>
19
20 #include <cassert>
21 #include <vector>
22
23 #include "test_macros.h"
24
fw(double x)25 double fw(double x)
26 {
27 return x+1;
28 }
29
main(int,char **)30 int main(int, char**)
31 {
32 {
33 typedef std::discrete_distribution<> D;
34 D d(0, 0, 1, fw);
35 std::vector<double> p = d.probabilities();
36 assert(p.size() == 1);
37 assert(p[0] == 1);
38 }
39 {
40 typedef std::discrete_distribution<> D;
41 D d(1, 0, 1, fw);
42 std::vector<double> p = d.probabilities();
43 assert(p.size() == 1);
44 assert(p[0] == 1);
45 }
46 {
47 typedef std::discrete_distribution<> D;
48 D d(2, 0.5, 1.5, fw);
49 std::vector<double> p = d.probabilities();
50 assert(p.size() == 2);
51 assert(p[0] == .4375);
52 assert(p[1] == .5625);
53 }
54 {
55 typedef std::discrete_distribution<> D;
56 D d(4, 0, 2, fw);
57 std::vector<double> p = d.probabilities();
58 assert(p.size() == 4);
59 assert(p[0] == .15625);
60 assert(p[1] == .21875);
61 assert(p[2] == .28125);
62 }
63
64 return 0;
65 }
66