28e82982fe
Now that we've branched for the LLVM 14 release, our support window moves to clang-13 and clang-14. Similarly, AppleClang 13 has been released for some time now, so that should be the oldest compiler we support, per our policy. A possible follow-up would be to remove _LIBCPP_HAS_NO_CONCEPTS, since I don't think we support any compiler that doesn't support concepts anymore. Differential Revision: https://reviews.llvm.org/D118831
37 lines
1.4 KiB
C++
37 lines
1.4 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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// <span>
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// template <class It>
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// constexpr explicit(Extent != dynamic_extent) span(It first, size_type count);
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// If Extent is not equal to dynamic_extent, then count shall be equal to Extent.
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//
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#include <span>
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#include <cstddef>
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template <class T, size_t extent>
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std::span<T, extent> createImplicitSpan(T* ptr, size_t len) {
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return {ptr, len}; // expected-error {{chosen constructor is explicit in copy-initialization}}
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}
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int main(int, char**) {
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// explicit constructor necessary
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int arr[] = {1, 2, 3};
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createImplicitSpan<int, 1>(arr, 3);
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std::span<int> sp = {0, 0}; // expected-error {{no matching constructor for initialization of 'std::span<int>'}}
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std::span<int, 2> sp2 = {0, 0}; // expected-error {{no matching constructor for initialization of 'std::span<int, 2>'}}
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std::span<const int> csp = {0, 0}; // expected-error {{no matching constructor for initialization of 'std::span<const int>'}}
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std::span<const int, 2> csp2 = {0, 0}; // expected-error {{no matching constructor for initialization of 'std::span<const int, 2>'}}
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return 0;
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}
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