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 _Tp>
29void where(const _Tp &) {}
30
31template <class T, T a, T c, T m>
32void
33test1()
34{
35    typedef std::linear_congruential_engine<T, a, c, m> LCE;
36    typedef typename LCE::result_type result_type;
37    static_assert((LCE::multiplier == a), "");
38    static_assert((LCE::increment == c), "");
39    static_assert((LCE::modulus == m), "");
40#if TEST_STD_VER >= 11
41    static_assert((LCE::min() == (c == 0u ? 1u: 0u)), "");
42#else
43    assert((LCE::min() == (c == 0u ? 1u: 0u)));
44#endif
45
46#ifdef _MSC_VER
47    #pragma warning(push)
48    #pragma warning(disable: 4310) // cast truncates constant value
49#endif // _MSC_VER
50
51#if TEST_STD_VER >= 11
52    static_assert((LCE::max() == result_type(m - 1u)), "");
53#else
54    assert((LCE::max() == result_type(m - 1u)));
55#endif
56
57#ifdef _MSC_VER
58    #pragma warning(pop)
59#endif // _MSC_VER
60
61    static_assert((LCE::default_seed == 1), "");
62    where(LCE::multiplier);
63    where(LCE::increment);
64    where(LCE::modulus);
65    where(LCE::default_seed);
66}
67
68template <class T>
69void
70test()
71{
72    test1<T, 0, 0, 0>();
73    test1<T, 0, 1, 2>();
74    test1<T, 1, 1, 2>();
75    const T M(static_cast<T>(-1));
76    test1<T, 0, 0, M>();
77    test1<T, 0, M-2, M>();
78    test1<T, 0, M-1, M>();
79    test1<T, M-2, 0, M>();
80    test1<T, M-2, M-2, M>();
81    test1<T, M-2, M-1, M>();
82    test1<T, M-1, 0, M>();
83    test1<T, M-1, M-2, M>();
84    test1<T, M-1, M-1, M>();
85}
86
87int main()
88{
89    test<unsigned short>();
90    test<unsigned int>();
91    test<unsigned long>();
92    test<unsigned long long>();
93}
94