//===----------------------------------------------------------------------===//
//
// 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-no-concepts
// UNSUPPORTED: libcpp-has-no-incomplete-ranges

// template<bool OtherConst>
//   requires sentinel_for<sentinel_t<Base>, iterator_t<maybe-const<OtherConst, V>>>
// friend constexpr bool operator==(const iterator<OtherConst>& x, const sentinel& y);

#include <cassert>
#include <ranges>

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

constexpr bool test() {
  int buffer[4][4] = {{1111, 2222, 3333, 4444}, {555, 666, 777, 888}, {99, 1010, 1111, 1212}, {13, 14, 15, 16}};

  {
    ChildView children[4] = {ChildView(buffer[0]), ChildView(buffer[1]), ChildView(buffer[2]), ChildView(buffer[3])};
    auto jv = std::ranges::join_view(ParentView(children));
    assert(jv.end() == std::ranges::next(jv.begin(), 16));
  }
  {
    CopyableChild children[4] = {CopyableChild(buffer[0]), CopyableChild(buffer[1]), CopyableChild(buffer[2]), CopyableChild(buffer[3])};
    const auto jv = std::ranges::join_view(ParentView(children));
    assert(jv.end() == std::ranges::next(jv.begin(), 16));
  }
  {
    CopyableChild children[4] = {CopyableChild(buffer[0]), CopyableChild(buffer[1]), CopyableChild(buffer[2]), CopyableChild(buffer[3])};
    const std::ranges::join_view jvc(CopyableParent{children});
          std::ranges::join_view jv(CopyableParent{children});
    assert(jvc.end() == std::ranges::next(jv.begin(), 16));
    assert( jv.end() == std::ranges::next(jvc.begin(), 16));
  }

  return true;
}

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

  return 0;
}