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 // <algorithm>
11
12 // template<class RandomAccessIterator, class UniformRandomNumberGenerator>
13 // void shuffle(RandomAccessIterator first, RandomAccessIterator last,
14 // UniformRandomNumberGenerator& g);
15
16 #include <algorithm>
17 #include <random>
18 #include <cassert>
19
20 #include "test_macros.h"
21
main()22 int main()
23 {
24 int ia[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
25 int ia1[] = {2, 7, 1, 4, 3, 6, 5, 10, 9, 8};
26 int ia2[] = {1, 8, 3, 4, 6, 9, 5, 7, 2, 10};
27 const unsigned sa = sizeof(ia)/sizeof(ia[0]);
28 std::minstd_rand g;
29 std::shuffle(ia, ia+sa, g);
30 LIBCPP_ASSERT(std::equal(ia, ia+sa, ia1));
31 assert(std::is_permutation(ia, ia+sa, ia1));
32 std::shuffle(ia, ia+sa, std::move(g));
33 LIBCPP_ASSERT(std::equal(ia, ia+sa, ia2));
34 assert(std::is_permutation(ia, ia+sa, ia2));
35 }
36