| 1 | //===----------------------------------------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | // UNSUPPORTED: c++03, c++11, c++14, c++17 |
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| 9 | |
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| 10 | // This test also generates spurious warnings when instantiating std::span |
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| 11 | // with a very large extent (like size_t(-2)) -- silence those. |
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| 12 | // ADDITIONAL_COMPILE_FLAGS: -Xclang -verify-ignore-unexpected=warning |
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| 13 | |
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| 14 | // <span> |
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| 15 | |
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| 16 | // template<size_t Offset, size_t Count = dynamic_extent> |
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| 17 | // constexpr span<element_type, see-below> subspan() const; |
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| 18 | // |
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| 19 | // Mandates: Offset <= Extent && (Count == dynamic_extent || Count <= Extent - Offset) is true. |
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| 20 | |
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| 21 | #include <span> |
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| 22 | #include <cstddef> |
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| 23 | |
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| 24 | void f() { |
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| 25 | int array[] = {1, 2, 3, 4}; |
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| 26 | std::span<const int, 4> sp(array); |
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| 27 | |
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| 28 | // Offset too large templatized |
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| 29 | [[maybe_unused]] auto s1 = |
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| 30 | sp.subspan<5>(); // expected-error@span:* {{span<T, N>::subspan<Offset, Count>(): Offset out of range}} |
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| 31 | |
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| 32 | // Count too large templatized |
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| 33 | [[maybe_unused]] auto s2 = |
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| 34 | sp.subspan<0, 5>(); // expected-error@span:* {{span<T, N>::subspan<Offset, Count>(): Offset + Count out of range}} |
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| 35 | |
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| 36 | // Offset + Count too large templatized |
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| 37 | [[maybe_unused]] auto s3 = |
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| 38 | sp.subspan<2, 3>(); // expected-error@span:* {{span<T, N>::subspan<Offset, Count>(): Offset + Count out of range}} |
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| 39 | |
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| 40 | // Offset + Count overflow templatized |
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| 41 | [[maybe_unused]] auto s4 = sp.subspan< |
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| 42 | 3, |
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| 43 | std::size_t( |
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| 44 | -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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| 45 | } |
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| 46 | |
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