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
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 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