94461822c7
`subrange` is also a `tuple-like`. To avoid the add entire `subrange` dependencies to `tuple-like`, we need forward declaration of `subrange`. However, the class template constraints of `subrange` currently requires `__iterator/concepts.h`, which requires `<concepts>`. The problem is that currently `tuple-like` is used in several different places, including libc++ extension for pair constructors. we don't want to add `<concepts>` to pair and other stuff. So this change also created several small headers that `subrange`'s declaration needed inside `__iterator/concepts/` Differential Revision: https://reviews.llvm.org/D136268
33 lines
1.0 KiB
C++
33 lines
1.0 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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//
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// template<class T, size_t N>
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// inline constexpr bool enable_borrowed_range<elements_view<T, N>> =
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// enable_borrowed_range<T>;
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#include <ranges>
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#include <tuple>
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struct NonBorrowed : std::ranges::view_base {
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std::tuple<int>* begin();
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std::tuple<int>* end();
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};
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struct Borrowed : std::ranges::view_base {
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std::tuple<int>* begin();
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std::tuple<int>* end();
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};
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template <>
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inline constexpr bool std::ranges::enable_borrowed_range<Borrowed> = true;
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static_assert(!std::ranges::borrowed_range<std::ranges::elements_view<NonBorrowed, 0>>);
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static_assert(std::ranges::borrowed_range<std::ranges::elements_view<Borrowed, 0>>);
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