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_constant_distribution
14
15 // template<class UnaryOperation>
16 // param_type(size_t nw, double xmin, double xmax,
17 // UnaryOperation fw);
18
19 #include <random>
20 #include <cassert>
21
fw(double x)22 double fw(double x)
23 {
24 return 2*x;
25 }
26
main()27 int main()
28 {
29 {
30 typedef std::piecewise_constant_distribution<> D;
31 typedef D::param_type P;
32 P pa(0, 0, 1, fw);
33 std::vector<double> iv = pa.intervals();
34 assert(iv.size() == 2);
35 assert(iv[0] == 0);
36 assert(iv[1] == 1);
37 std::vector<double> dn = pa.densities();
38 assert(dn.size() == 1);
39 assert(dn[0] == 1);
40 }
41 {
42 typedef std::piecewise_constant_distribution<> D;
43 typedef D::param_type P;
44 P pa(1, 10, 12, fw);
45 std::vector<double> iv = pa.intervals();
46 assert(iv.size() == 2);
47 assert(iv[0] == 10);
48 assert(iv[1] == 12);
49 std::vector<double> dn = pa.densities();
50 assert(dn.size() == 1);
51 assert(dn[0] == 0.5);
52 }
53 {
54 typedef std::piecewise_constant_distribution<> D;
55 typedef D::param_type P;
56 P pa(2, 6, 14, fw);
57 std::vector<double> iv = pa.intervals();
58 assert(iv.size() == 3);
59 assert(iv[0] == 6);
60 assert(iv[1] == 10);
61 assert(iv[2] == 14);
62 std::vector<double> dn = pa.densities();
63 assert(dn.size() == 2);
64 assert(dn[0] == 0.1);
65 assert(dn[1] == 0.15);
66 }
67 }
68