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
28 template <class _Tp>
where(const _Tp &)29 void where(const _Tp &) {}
30
31 template <class T, T a, T c, T m>
32 void
test1()33 test1()
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 /*static_*/assert((LCE::min() == (c == 0u ? 1u: 0u))/*, ""*/);
41 /*static_*/assert((LCE::max() == result_type(m - 1u))/*, ""*/);
42 static_assert((LCE::default_seed == 1), "");
43 where(LCE::multiplier);
44 where(LCE::increment);
45 where(LCE::modulus);
46 where(LCE::default_seed);
47 }
48
49 template <class T>
50 void
test()51 test()
52 {
53 test1<T, 0, 0, 0>();
54 test1<T, 0, 1, 2>();
55 test1<T, 1, 1, 2>();
56 const T M(~0);
57 test1<T, 0, 0, M>();
58 test1<T, 0, M-2, M>();
59 test1<T, 0, M-1, M>();
60 test1<T, M-2, 0, M>();
61 test1<T, M-2, M-2, M>();
62 test1<T, M-2, M-1, M>();
63 test1<T, M-1, 0, M>();
64 test1<T, M-1, M-2, M>();
65 test1<T, M-1, M-1, M>();
66 }
67
main()68 int main()
69 {
70 test<unsigned short>();
71 test<unsigned int>();
72 test<unsigned long>();
73 test<unsigned long long>();
74 }
75