//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

// UNSUPPORTED: c++03, c++11, c++14, c++17
// UNSUPPORTED: libcpp-has-no-incomplete-ranges

// constexpr sentinel(sentinel<!Const> s);

#include <cassert>
#include <ranges>

#include "test_macros.h"
#include "../types.h"

constexpr bool test() {
  int buffer[4][4] = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 16}};

  CopyableChild children[4] = {CopyableChild(buffer[0]), CopyableChild(buffer[1]), CopyableChild(buffer[2]), CopyableChild(buffer[3])};
  std::ranges::join_view jv(CopyableParent{children});
  auto sent1 = jv.end();
  std::ranges::sentinel_t<const decltype(jv)> sent2 = sent1;
  (void) sent2; // We can't really do anything with these sentinels now :/

  // We cannot create a non-const iterator from a const iterator.
  static_assert(!std::constructible_from<decltype(sent1), decltype(sent2)>);

  return true;
}

int main(int, char**) {
  test();
  static_assert(test());

  return 0;
}