1 //===----------------------------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 // <random>
10
11 // class seed_seq;
12
13 // template<class InputIterator>
14 // seed_seq(InputIterator begin, InputIterator end);
15
16 #include <random>
17 #include <cassert>
18
19 #include "test_macros.h"
20
test()21 void test()
22 {
23 {
24 unsigned a[5] = {5, 4, 3, 2, 1};
25 std::seed_seq s(a, a+5);
26 assert(s.size() == 5);
27
28 unsigned b[5] = {0};
29 s.param(b);
30 assert(b[0] == 5);
31 assert(b[1] == 4);
32 assert(b[2] == 3);
33 assert(b[3] == 2);
34 assert(b[4] == 1);
35 }
36 {
37 // Test truncation to 32 bits
38 unsigned long long a[4] = {
39 0x1234000056780000uLL,
40 0x0000001234567800uLL,
41 0xFFFFFFFFFFFFFFFFuLL,
42 0x0000000180000000uLL,
43 };
44 std::seed_seq s(a, a+4);
45 assert(s.size() == 4);
46
47 unsigned b[4] = {0};
48 s.param(b);
49 assert(b[0] == 0x56780000u);
50 assert(b[1] == 0x34567800u);
51 assert(b[2] == 0xFFFFFFFFu);
52 assert(b[3] == 0x80000000u);
53 }
54 #if TEST_STD_VER >= 11
55 {
56 // Test uniform initialization syntax (LWG 3422)
57 unsigned a[3] = {1, 2, 3};
58 std::seed_seq s{a, a+3}; // uniform initialization
59 assert(s.size() == 3);
60
61 unsigned b[3] = {0};
62 s.param(b);
63 assert(b[0] == 1);
64 assert(b[1] == 2);
65 assert(b[2] == 3);
66 }
67 #endif // TEST_STD_VER >= 11
68 }
69
main(int,char **)70 int main(int, char**)
71 {
72 test();
73
74 return 0;
75 }
76