values.pass.cpp revision b64f8b07c104c6cc986570ac8ee0ed16a9f23976 
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 UIntType, UIntType a, UIntType c, UIntType m>
13// class linear_congruential_engine
14// {
15// public:
16//     engine characteristics
17//     static constexpr result_type multiplier = a;
18//     static constexpr result_type increment = c;
19//     static constexpr result_type modulus = m;
20//     static constexpr result_type min() { return c == 0u ? 1u: 0u;}
21//     static constexpr result_type max() { return m - 1u;}
22//     static constexpr result_type default_seed = 1u;
23
24#include <random>
25#include <type_traits>
26#include <cassert>
27
28template <class T, T a, T c, T m>
29void
30test1()
31{
32    typedef std::linear_congruential_engine<T, a, c, m> LCE;
33    typedef typename LCE::result_type result_type;
34    static_assert((LCE::multiplier == a), "");
35    static_assert((LCE::increment == c), "");
36    static_assert((LCE::modulus == m), "");
37    /*static_*/assert((LCE::min() == (c == 0u ? 1u: 0u))/*, ""*/);
38    /*static_*/assert((LCE::max() == result_type(m - 1u))/*, ""*/);
39    static_assert((LCE::default_seed == 1), "");
40}
41
42template <class T>
43void
44test()
45{
46    test1<T, 0, 0, 0>();
47    test1<T, 0, 1, 2>();
48    test1<T, 1, 1, 2>();
49    const T M(~0);
50    test1<T, 0, 0, M>();
51    test1<T, 0, M-2, M>();
52    test1<T, 0, M-1, M>();
53    test1<T, M-2, 0, M>();
54    test1<T, M-2, M-2, M>();
55    test1<T, M-2, M-1, M>();
56    test1<T, M-1, 0, M>();
57    test1<T, M-1, M-2, M>();
58    test1<T, M-1, M-1, M>();
59}
60
61int main()
62{
63    test<unsigned short>();
64    test<unsigned int>();
65    test<unsigned long>();
66    test<unsigned long long>();
67}
68