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
69 lines
2.5 KiB
C++
69 lines
2.5 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 <cassert>
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#include <iterator>
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#include <type_traits>
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template <size_t Extent>
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constexpr void test_constructibility() {
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struct Other {};
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static_assert(std::is_constructible_v<std::span<int, Extent>, int*, size_t>);
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static_assert(!std::is_constructible_v<std::span<int, Extent>, const int*, size_t>);
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static_assert(std::is_constructible_v<std::span<const int, Extent>, int*, size_t>);
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static_assert(std::is_constructible_v<std::span<const int, Extent>, const int*, size_t>);
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static_assert(!std::is_constructible_v<std::span<int, Extent>, volatile int*, size_t>);
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static_assert(!std::is_constructible_v<std::span<int, Extent>, const volatile int*, size_t>);
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static_assert(!std::is_constructible_v<std::span<const int, Extent>, volatile int*, size_t>);
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static_assert(!std::is_constructible_v<std::span<const int, Extent>, const volatile int*, size_t>);
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static_assert(!std::is_constructible_v<std::span<volatile int, Extent>, const int*, size_t>);
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static_assert(!std::is_constructible_v<std::span<volatile int, Extent>, const volatile int*, size_t>);
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static_assert(
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!std::is_constructible_v<std::span<int, Extent>, double*, size_t>); // iterator type differs from span type
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static_assert(!std::is_constructible_v<std::span<int, Extent>, size_t, size_t>);
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static_assert(!std::is_constructible_v<std::span<int, Extent>, Other*, size_t>); // unrelated iterator type
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}
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template <class T>
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constexpr bool test_ctor() {
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T val[2] = {};
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auto s1 = std::span<T>(val, 2);
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auto s2 = std::span<T, 2>(val, 2);
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assert(s1.data() == std::data(val) && s1.size() == std::size(val));
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assert(s2.data() == std::data(val) && s2.size() == std::size(val));
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return true;
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}
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constexpr bool test() {
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test_constructibility<std::dynamic_extent>();
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test_constructibility<3>();
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struct A {};
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test_ctor<int>();
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test_ctor<A>();
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return true;
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}
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int main(int, char**) {
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test();
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static_assert(test());
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return 0;
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}
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