//===----------------------------------------------------------------------===//
//
// 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

// <span>
//
// constexpr span<element_type, dynamic_extent> first(size_type count) const;

// Make sure that creating a sub-span with an incorrect number of elements triggers an assertion.

// REQUIRES: has-unix-headers
// UNSUPPORTED: libcpp-hardening-mode=none
// XFAIL: libcpp-hardening-mode=debug && availability-verbose_abort-missing

#include <array>
#include <span>

#include "check_assertion.h"

int main(int, char**) {
  {
    std::array<int, 3> array{0, 1, 2};
    std::span<int> const s(array.data(), array.size());
    TEST_LIBCPP_ASSERT_FAILURE(s.first(4), "span<T>::first(count): count out of range");
    TEST_LIBCPP_ASSERT_FAILURE(s.first<4>(), "span<T>::first<Count>(): Count out of range");
  }
  {
    std::array<int, 3> array{0, 1, 2};
    std::span<int, 3> const s(array.data(), array.size());
    TEST_LIBCPP_ASSERT_FAILURE(s.first(4), "span<T, N>::first(count): count out of range");
    // s.first<4>() caught at compile-time (tested elsewhere)
  }

  return 0;
}
