3a208c6894
Implement https://wg21.link/p1394 which allows span to be constructible from any contiguous forwarding-range that has a compatible element type. Fixes https://bugs.llvm.org/show_bug.cgi?id=51443 Reviewed By: ldionne, Quuxplusone, #libc Differential Revision: https://reviews.llvm.org/D110503
38 lines
1.2 KiB
C++
38 lines
1.2 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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// UNSUPPORTED: libcpp-has-no-incomplete-ranges
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// AppleClang 12.0.0 doesn't fully support ranges/concepts
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// XFAIL: apple-clang-12.0.0
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// <span>
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// template <class It, class End>
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// constexpr explicit(Extent != dynamic_extent) span(It first, End last);
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// Requires: [first, last) shall be a valid range.
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// If Extent is not equal to dynamic_extent, then last - first shall be equal to Extent.
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//
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#include <span>
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#include <iterator>
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template<class T, size_t Extent>
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std::span<T, Extent> createImplicitSpan(T* first, T* last) {
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return {first, last}; // 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>(std::begin(arr), std::end(arr));
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return 0;
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}
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