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 // REQUIRES: c++98 || c++03 || c++11 || c++14
12
13 // template<RandomAccessIterator Iter>
14 // requires ShuffleIterator<Iter>
15 // void
16 // random_shuffle(Iter first, Iter last);
17
18 #include <algorithm>
19 #include <cassert>
20
21 #include "test_macros.h"
22
main()23 int main()
24 {
25 int ia[] = {1, 2, 3, 4};
26 int ia1[] = {1, 4, 3, 2};
27 int ia2[] = {4, 1, 2, 3};
28 const unsigned sa = sizeof(ia)/sizeof(ia[0]);
29 std::random_shuffle(ia, ia+sa);
30 LIBCPP_ASSERT(std::equal(ia, ia+sa, ia1));
31 assert(std::is_permutation(ia, ia+sa, ia1));
32 std::random_shuffle(ia, ia+sa);
33 LIBCPP_ASSERT(std::equal(ia, ia+sa, ia2));
34 assert(std::is_permutation(ia, ia+sa, ia2));
35 }
36