1 //===----------------------------------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
12 // template<RandomAccessIterator Iter, Callable<auto, Iter::difference_type> Rand>
13 // requires ShuffleIterator<Iter>
14 // && Convertible<Rand::result_type, Iter::difference_type>
16 // random_shuffle(Iter first, Iter last, Rand&& rand);
22 #include "test_macros.h"
26 std::ptrdiff_t operator()(std::ptrdiff_t n)
34 int ia[] = {1, 2, 3, 4};
35 int ia1[] = {4, 1, 2, 3};
36 const unsigned sa = sizeof(ia)/sizeof(ia[0]);
38 std::random_shuffle(ia, ia+sa, r);
39 LIBCPP_ASSERT(std::equal(ia, ia+sa, ia1));
40 assert(std::is_permutation(ia, ia+sa, ia1));