Differential D127401 Diff 435519 libcxx/test/libcxx/containers/views/views.span/span.elem/assert.back.pass.cpp

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				//===----------------------------------------------------------------------===//
				//
				// 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 reference back() const noexcept;

				// Make sure that accessing a span out-of-bounds triggers an assertion.

				// REQUIRES: has-unix-headers
				// UNSUPPORTED: c++03
				// XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx{{10.9\|10.10\|10.11\|10.12\|10.13\|10.14\|10.15\|11.0\|12.0}}
				// ADDITIONAL_COMPILE_FLAGS: -D_LIBCPP_ENABLE_ASSERTIONS=1

				#include <span>

				#include "check_assertion.h"

				int main(int, char**) {
				{
				int array[] = {0, 1, 2};
				std::span<int> const s(&array[0], 0);
				TEST_LIBCPP_ASSERT_FAILURE(s.back(), "span<T>::back() on empty span");
				}

				{
				int array[] = {0, 1, 2};
				std::span<int, 0> const s(&array[0], 0);
				TEST_LIBCPP_ASSERT_FAILURE(s.back(), "span<T, N>::back() on empty span");
				}

				return 0;
				}