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llvm-project/libcxx/include/__ranges/enable_borrowed_range.h

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[libc++] Implements ranges::enable_borrowed_range This is the initial patch to implement ranges in libc++. Implements parts of: - P0896R4 One Ranges Proposal - P1870 forwarding-range is too subtle - LWG3379 in several library names is misleading Reviewed By: ldionne, #libc, cjdb, zoecarver, Quuxplusone Differential Revision: https://reviews.llvm.org/D90999
2020-11-25 01:08:02 +08:00
// -*- C++ -*-
[runtimes][NFC] Remove filenames at the top of the license notice We've stopped doing it in libc++ for a while now because these names would end up rotting as we move things around and copy/paste stuff. This cleans up all the existing files so as to stop the spreading as people copy-paste headers around.
2021-11-18 05:25:01 +08:00
//===----------------------------------------------------------------------===//
[libc++] Implements ranges::enable_borrowed_range This is the initial patch to implement ranges in libc++. Implements parts of: - P0896R4 One Ranges Proposal - P1870 forwarding-range is too subtle - LWG3379 in several library names is misleading Reviewed By: ldionne, #libc, cjdb, zoecarver, Quuxplusone Differential Revision: https://reviews.llvm.org/D90999
2020-11-25 01:08:02 +08:00
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef _LIBCPP___RANGES_ENABLE_BORROWED_RANGE_H
#define _LIBCPP___RANGES_ENABLE_BORROWED_RANGE_H
// These customization variables are used in <span> and <string_view>. The
// separate header is used to avoid including the entire <ranges> header in
// <span> and <string_view>.
#include <__config>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
[libc++] Normalize all our '#pragma GCC system_header', and regression-test. Now we'll notice if a header forgets to include this magic phrase. Differential Revision: https://reviews.llvm.org/D118800
2022-02-02 09:16:40 +08:00
# pragma GCC system_header
[libc++] Implements ranges::enable_borrowed_range This is the initial patch to implement ranges in libc++. Implements parts of: - P0896R4 One Ranges Proposal - P1870 forwarding-range is too subtle - LWG3379 in several library names is misleading Reviewed By: ldionne, #libc, cjdb, zoecarver, Quuxplusone Differential Revision: https://reviews.llvm.org/D90999
2020-11-25 01:08:02 +08:00
#endif
_LIBCPP_BEGIN_NAMESPACE_STD
[libc++] Replace _LIBCPP_HAS_NO_CONCEPTS with _LIBCPP_STD_VER > 17. NFCI. All supported compilers that support C++20 now support concepts. So, remove `_LIB_LIBCPP_HAS_NO_CONCEPTS` in favor of `_LIBCPP_STD_VER > 17`. Similarly in the tests, remove `// UNSUPPORTED: libcpp-no-concepts`. Differential Revision: https://reviews.llvm.org/D121528
2022-03-12 23:46:57 +08:00
#if _LIBCPP_STD_VER > 17
[libc++] Implements ranges::enable_borrowed_range This is the initial patch to implement ranges in libc++. Implements parts of: - P0896R4 One Ranges Proposal - P1870 forwarding-range is too subtle - LWG3379 in several library names is misleading Reviewed By: ldionne, #libc, cjdb, zoecarver, Quuxplusone Differential Revision: https://reviews.llvm.org/D90999
2020-11-25 01:08:02 +08:00
[libc++] Guard much of std::ranges under _LIBCPP_HAS_NO_INCOMPLETE_RANGES. The logic here is that we are disabling *only* things in `std::ranges::`. Everything in `std::` is permitted, including `default_sentinel`, `contiguous_iterator`, `common_iterator`, `projected`, `swappable`, and so on. Then, we include anything from `std::ranges::` that is required in order to make those things work: `ranges::swap`, `ranges::swap_ranges`, `input_range`, `ranges::begin`, `ranges::iter_move`, and so on. But then that's all. Everything else (including notably all of the "views" and the `std::views` namespace itself) is still locked up behind `_LIBCPP_HAS_NO_INCOMPLETE_RANGES`. Differential Revision: https://reviews.llvm.org/D118736
2022-02-02 05:52:02 +08:00
namespace ranges {
[libc++] Implements ranges::enable_borrowed_range This is the initial patch to implement ranges in libc++. Implements parts of: - P0896R4 One Ranges Proposal - P1870 forwarding-range is too subtle - LWG3379 in several library names is misleading Reviewed By: ldionne, #libc, cjdb, zoecarver, Quuxplusone Differential Revision: https://reviews.llvm.org/D90999
2020-11-25 01:08:02 +08:00
// [range.range], ranges
template <class>
inline constexpr bool enable_borrowed_range = false;
} // namespace ranges
[libc++] Replace _LIBCPP_HAS_NO_CONCEPTS with _LIBCPP_STD_VER > 17. NFCI. All supported compilers that support C++20 now support concepts. So, remove `_LIB_LIBCPP_HAS_NO_CONCEPTS` in favor of `_LIBCPP_STD_VER > 17`. Similarly in the tests, remove `// UNSUPPORTED: libcpp-no-concepts`. Differential Revision: https://reviews.llvm.org/D121528
2022-03-12 23:46:57 +08:00
#endif // _LIBCPP_STD_VER > 17
[libc++] Implements ranges::enable_borrowed_range This is the initial patch to implement ranges in libc++. Implements parts of: - P0896R4 One Ranges Proposal - P1870 forwarding-range is too subtle - LWG3379 in several library names is misleading Reviewed By: ldionne, #libc, cjdb, zoecarver, Quuxplusone Differential Revision: https://reviews.llvm.org/D90999
2020-11-25 01:08:02 +08:00
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___RANGES_ENABLE_BORROWED_RANGE_H