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a5544970 | 1 | // Copyright (C) 2018-2019 Free Software Foundation, Inc. |
5a7960da JW |
2 | // |
3 | // This file is part of the GNU ISO C++ Library. This library is free | |
4 | // software; you can redistribute it and/or modify it under the | |
5 | // terms of the GNU General Public License as published by the | |
6 | // Free Software Foundation; either version 3, or (at your option) | |
7 | // any later version. | |
8 | ||
9 | // This library is distributed in the hope that it will be useful, | |
10 | // but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | // GNU General Public License for more details. | |
13 | ||
14 | // You should have received a copy of the GNU General Public License along | |
15 | // with this library; see the file COPYING3. If not see | |
16 | // <http://www.gnu.org/licenses/>. | |
17 | ||
18 | // { dg-do run { target c++11 } } | |
19 | // { dg-require-cstdint "" } | |
20 | ||
21 | #include <random> | |
22 | #include <testsuite_hooks.h> | |
23 | ||
24 | template<typename T> | |
25 | struct seed_seq | |
26 | { | |
27 | using result_type = unsigned; | |
28 | ||
29 | seed_seq() { } | |
30 | ||
31 | template<class U> | |
32 | seed_seq(std::initializer_list<U>) { } | |
33 | ||
34 | template<class InputIterator> | |
35 | seed_seq(InputIterator, InputIterator) { } | |
36 | ||
37 | template<class RandomAccessIterator> | |
38 | void generate(RandomAccessIterator first, RandomAccessIterator last) | |
39 | { | |
40 | called = true; | |
41 | if (first != last) | |
42 | *first = 42; | |
43 | } | |
44 | ||
45 | size_t size() const { called = true; return 1; } | |
46 | ||
47 | template<class OutputIterator> | |
48 | void param(OutputIterator dest) const { called = true; dest = 42; } | |
49 | ||
50 | // Prevents this type being considered as a seed sequence when | |
51 | // T is convertible to the engine's result_type: | |
52 | operator T() const noexcept { return T(); } | |
53 | ||
54 | bool called = false; | |
55 | }; | |
56 | ||
57 | using engine_type | |
58 | = std::mersenne_twister_engine< | |
59 | unsigned long, 32, 624, 397, 31, | |
60 | 0x9908b0dful, 11, | |
61 | 0xfffffffful, 7, | |
62 | 0x9d2c5680ul, 15, | |
63 | 0xefc60000ul, 18, 1812433253ul>; | |
64 | ||
65 | void | |
66 | test01() | |
67 | { | |
68 | seed_seq<unsigned> seed; | |
69 | engine_type x(seed); | |
70 | VERIFY( ! seed.called ); | |
71 | } | |
72 | ||
73 | void | |
74 | test02() | |
75 | { | |
76 | seed_seq<void*> seed; | |
77 | engine_type x(seed); | |
78 | VERIFY( seed.called ); | |
79 | ||
80 | static_assert(!std::is_constructible<engine_type, const seed_seq<void>&>(), | |
81 | "Cannot construct from a const seed_seq"); | |
82 | } | |
83 | ||
84 | int main() | |
85 | { | |
86 | test01(); | |
87 | test02(); | |
88 | } |