1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// <algorithm>
10
11// template<class RandomAccessIterator, class UniformRandomNumberGenerator>
12// void shuffle(RandomAccessIterator first, RandomAccessIterator last,
13// UniformRandomNumberGenerator& g);
14
15#include <algorithm>
16#include <random>
17#include <cassert>
18
19#include "test_macros.h"
20
21int main(int, char**)
22{
23 int ia[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
24 int ia1[] = {2, 7, 1, 4, 3, 6, 5, 10, 9, 8};
25 int ia2[] = {1, 8, 3, 4, 6, 9, 5, 7, 2, 10};
26 const unsigned sa = sizeof(ia)/sizeof(ia[0]);
27 std::minstd_rand g;
28 std::shuffle(first: ia, last: ia+sa, g&: g);
29 LIBCPP_ASSERT(std::equal(ia, ia+sa, ia1));
30 assert(std::is_permutation(ia, ia+sa, ia1));
31 std::shuffle(ia, ia+sa, std::move(g));
32 LIBCPP_ASSERT(std::equal(ia, ia+sa, ia2));
33 assert(std::is_permutation(ia, ia+sa, ia2));
34
35 return 0;
36}
37

source code of libcxx/test/std/algorithms/alg.modifying.operations/alg.random.shuffle/random_shuffle_urng.pass.cpp