Differential D127401 Diff 435519 libcxx/test/std/containers/views/views.span/span.sub/subspan.verify.cpp

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libcxx/test/std/containers/views/views.span/span.sub/subspan.verify.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

				// This test also generates spurious warnings when instantiating std::span
				// with a very large extent (like size_t(-2)) -- silence those.
				// ADDITIONAL_COMPILE_FLAGS: -Xclang -verify-ignore-unexpected=warning

				// <span>

				// template<size_t Offset, size_t Count = dynamic_extent>
				// constexpr span<element_type, see below> subspan() const;
				//
				// Requires: offset <= size() &&
				// (count == dynamic_extent \|\| count <= size() - offset)

				#include <span>
				#include <cstddef>

				void f() {
				int array[] = {1, 2, 3, 4};
				std::span<const int, 4> sp(array);

				// Offset too large templatized
				[[maybe_unused]] auto s1 = sp.subspan<5>(); // expected-error@span:* {{span<T, N>::subspan<Offset, Count>(): Offset out of range"}}

				// Count too large templatized
				[[maybe_unused]] auto s2 = sp.subspan<0, 5>(); // expected-error@span:* {{span<T, N>::subspan<Offset, Count>(): Offset + Count out of range"}}

				// Offset + Count too large templatized
				[[maybe_unused]] auto s3 = sp.subspan<2, 3>(); // expected-error@span:* {{span<T, N>::subspan<Offset, Count>(): Offset + Count out of range"}}

				// Offset + Count overflow templatized
				[[maybe_unused]] auto s4 = sp.subspan<3, std::size_t(-2)>(); // expected-error@span:* {{span<T, N>::subspan<Offset, Count>(): Offset + Count out of range"}}, expected-error-re@span:* {{array is too large{{(.* elements)}}}}
				}