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