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
22int 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