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//===----------------------------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
// <algorithm>
// template<RandomAccessIterator Iter, Callable<auto, Iter::difference_type> Rand>
// requires ShuffleIterator<Iter>
// && Convertible<Rand::result_type, Iter::difference_type>
// void
// random_shuffle(Iter first, Iter last, Rand&& rand);
#include <algorithm>
#include <cassert>
#include <cstddef>
#include "test_macros.h"
struct gen
{
std::ptrdiff_t operator()(std::ptrdiff_t n)
{
return n-1;
}
};
int main()
{
int ia[] = {1, 2, 3, 4};
int ia1[] = {4, 1, 2, 3};
const unsigned sa = sizeof(ia)/sizeof(ia[0]);
gen r;
std::random_shuffle(ia, ia+sa, r);
LIBCPP_ASSERT(std::equal(ia, ia+sa, ia1));
assert(std::is_permutation(ia, ia+sa, ia1));
}
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