41 lines
1.7 KiB
C++
41 lines
1.7 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// This test also generates spurious warnings when instantiating std::span
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// with a very large extent (like size_t(-2)) -- silence those.
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// ADDITIONAL_COMPILE_FLAGS: -Xclang -verify-ignore-unexpected=warning
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// <span>
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// template<size_t Offset, size_t Count = dynamic_extent>
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// constexpr span<element_type, see below> subspan() const;
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//
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// Requires: offset <= size() &&
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// (count == dynamic_extent || count <= size() - offset)
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#include <span>
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#include <cstddef>
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void f() {
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int array[] = {1, 2, 3, 4};
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std::span<const int, 4> sp(array);
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// Offset too large templatized
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[[maybe_unused]] auto s1 = sp.subspan<5>(); // expected-error@span:* {{span<T, N>::subspan<Offset, Count>(): Offset out of range}}
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// Count too large templatized
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[[maybe_unused]] auto s2 = sp.subspan<0, 5>(); // expected-error@span:* {{span<T, N>::subspan<Offset, Count>(): Offset + Count out of range}}
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// Offset + Count too large templatized
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[[maybe_unused]] auto s3 = sp.subspan<2, 3>(); // expected-error@span:* {{span<T, N>::subspan<Offset, Count>(): Offset + Count out of range}}
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// Offset + Count overflow templatized
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[[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)}}}}
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}
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