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
46 lines
1.3 KiB
C++
46 lines
1.3 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<size_t Count>
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// constexpr span<element_type, Count> last() const;
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//
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// constexpr span<element_type, dynamic_extent> last(size_type count) const;
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//
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// Requires: Count <= size().
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#include <span>
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#include <cstddef>
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#include "test_macros.h"
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constexpr int carr[] = {1, 2, 3, 4};
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int main(int, char**) {
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std::span<const int, 4> sp(carr);
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// Count too large
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{
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[[maybe_unused]] auto s1 = sp.last<5>(); // expected-error-re@span:* {{static_assert failed{{( due to requirement '.*')?}} "Count out of range in span::last()"}}
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}
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// Count numeric_limits
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{
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[[maybe_unused]] auto s1 = sp.last<std::size_t(-1)>(); // expected-error-re@span:* {{static_assert failed{{( due to requirement '.*')?}} "Count out of range in span::last()"}}
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}
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return 0;
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}
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