1 //===----------------------------------------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 // <random>
11
12 // template<class RealType = double>
13 // class piecewise_linear_distribution
14
15 // template<class UnaryOperation>
16 // piecewise_linear_distribution(size_t nw, result_type xmin,
17 // result_type xmax, UnaryOperation fw);
18
19 #include <iostream>
20
21 #include <random>
22 #include <cassert>
23
fw(double x)24 double fw(double x)
25 {
26 return 2*x;
27 }
28
main()29 int main()
30 {
31 {
32 typedef std::piecewise_linear_distribution<> D;
33 D d(0, 0, 1, fw);
34 std::vector<double> iv = d.intervals();
35 assert(iv.size() == 2);
36 assert(iv[0] == 0);
37 assert(iv[1] == 1);
38 std::vector<double> dn = d.densities();
39 assert(dn.size() == 2);
40 assert(dn[0] == 0);
41 assert(dn[1] == 2);
42 }
43 {
44 typedef std::piecewise_linear_distribution<> D;
45 D d(1, 10, 12, fw);
46 std::vector<double> iv = d.intervals();
47 assert(iv.size() == 2);
48 assert(iv[0] == 10);
49 assert(iv[1] == 12);
50 std::vector<double> dn = d.densities();
51 assert(dn.size() == 2);
52 assert(dn[0] == 20./44);
53 assert(dn[1] == 24./44);
54 }
55 {
56 typedef std::piecewise_linear_distribution<> D;
57 D d(2, 6, 14, fw);
58 std::vector<double> iv = d.intervals();
59 assert(iv.size() == 3);
60 assert(iv[0] == 6);
61 assert(iv[1] == 10);
62 assert(iv[2] == 14);
63 std::vector<double> dn = d.densities();
64 assert(dn.size() == 3);
65 assert(dn[0] == 0.075);
66 assert(dn[1] == 0.125);
67 assert(dn[2] == 0.175);
68 }
69 }
70