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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
1 parent aa80ea8 commit 01ace07

18 files changed

+379
-4
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‎libcxx/docs/Cxx2aStatusIssuesStatus.csv

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"`3374 <https://wg21.link/LWG3374>`__","P0653 + P1006 should have made the other ``std::to_address``\ overload ``constexpr``\ ","Prague","|Complete|","12.0"
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"`3375 <https://wg21.link/LWG3375>`__","``decay``\ in ``viewable_range``\ should be ``remove_cvref``\ ","Prague","",""
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"`3377 <https://wg21.link/LWG3377>`__","``elements_view::iterator``\ befriends a specialization of itself","Prague","",""
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"`3379 <https://wg21.link/LWG3379>`__","""``safe``\ "" in several library names is misleading","Prague","",""
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"`3379 <https://wg21.link/LWG3379>`__","""``safe``\ "" in several library names is misleading","Prague","|In Progress|",""
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"`3380 <https://wg21.link/LWG3380>`__","``common_type``\ and comparison categories","Prague","",""
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"`3381 <https://wg21.link/LWG3381>`__","``begin``\ and ``data``\ must agree for ``contiguous_range``\ ","Prague","",""
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"`3382 <https://wg21.link/LWG3382>`__","NTTP for ``pair``\ and ``array``\ ","Prague","",""

‎libcxx/docs/Cxx2aStatusPaperStatus.csv

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"`P1862 <https://wg21.link/P1862>`__","LWG","Ranges adaptors for non-copyable iterators","Belfast","* *",""
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"`P1865 <https://wg21.link/P1865>`__","LWG","Add max() to latch and barrier","Belfast","|Complete|","11.0"
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"`P1869 <https://wg21.link/P1869>`__","LWG","Rename 'condition_variable_any' interruptible wait methods","Belfast","* *",""
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"`P1870 <https://wg21.link/P1870>`__","LWG","forwarding-range is too subtle","Belfast","* *",""
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"`P1870 <https://wg21.link/P1870>`__","LWG","forwarding-range is too subtle","Belfast","|In Progress|",""
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"`P1871 <https://wg21.link/P1871>`__","LWG","Should concepts be enabled or disabled?","Belfast","* *",""
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"`P1872 <https://wg21.link/P1872>`__","LWG","span should have size_type, not index_type","Belfast","|Complete|","10.0"
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"`P1878 <https://wg21.link/P1878>`__","LWG","Constraining Readable Types","Belfast","* *",""

‎libcxx/include/CMakeLists.txt

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@@ -30,6 +30,7 @@ set(files
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__mutex_base
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__node_handle
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__nullptr
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__ranges/enable_borrowed_range.h
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__split_buffer
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__sso_allocator
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__std_stream
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ostream
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queue
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random
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ranges
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ratio
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regex
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scoped_allocator

‎libcxx/include/__ranges/enable_borrowed_range.h

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// -*- C++ -*-
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//===------------------ __ranges/enable_borrowed_range.h ------------------===//
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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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#ifndef _LIBCPP___RANGES_ENABLE_BORROWED_RANGE_H
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#define _LIBCPP___RANGES_ENABLE_BORROWED_RANGE_H
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// These customization variables are used in <span> and <string_view>. The
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// separate header is used to avoid including the entire <ranges> header in
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// <span> and <string_view>.
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#include <__config>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_RANGES)
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namespace ranges
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{
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// [range.range], ranges
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template <class>
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inline constexpr bool enable_borrowed_range = false;
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} // namespace ranges
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#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_RANGES)
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___RANGES_ENABLE_BORROWED_RANGE_H

‎libcxx/include/module.modulemap

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@@ -409,6 +409,10 @@ module std [system] {
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export initializer_list
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export *
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}
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module ranges {
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header "ranges"
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export *
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}
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module ratio {
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header "ratio"
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export *

‎libcxx/include/ranges

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// -*- C++ -*-
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//===--------------------------- ranges -----------------------------------===//
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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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#ifndef _LIBCPP_RANGES
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#define _LIBCPP_RANGES
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/*
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#include <compare> // see [compare.syn]
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#include <initializer_list> // see [initializer.list.syn]
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#include <iterator> // see [iterator.synopsis]
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namespace std::ranges {
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// [range.range], ranges
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template<class T>
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inline constexpr bool enable_borrowed_range = false;
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}
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*/
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#include <__config>
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#include <__ranges/enable_borrowed_range.h>
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#include <compare> // Required by the standard.
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#include <initializer_list> // Required by the standard.
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#include <iterator> // Required by the standard.
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#include <type_traits>
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#include <version>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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#pragma GCC system_header
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#endif
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_LIBCPP_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_RANGES)
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#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_RANGES)
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP_RANGES

‎libcxx/include/span

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@@ -22,6 +22,9 @@ inline constexpr size_t dynamic_extent = numeric_limits<size_t>::max();
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template <class ElementType, size_t Extent = dynamic_extent>
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class span;
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template<class ElementType, size_t Extent>
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inline constexpr bool ranges::enable_borrowed_range<span<ElementType, Extent>> = true;
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// [span.objectrep], views of object representation
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template <class ElementType, size_t Extent>
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span<const byte, ((Extent == dynamic_extent) ? dynamic_extent :
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(sizeof(ElementType) * Extent))> as_writable_bytes(span<ElementType, Extent> s) noexcept;
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namespace std {
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template <class ElementType, size_t Extent = dynamic_extent>
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class span {
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public:
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*/
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#include <__config>
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#include <__ranges/enable_borrowed_range.h>
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#include <array> // for array
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#include <cstddef> // for byte
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#include <iterator> // for iterators
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size_type __size;
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};
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#if !defined(_LIBCPP_HAS_NO_RANGES)
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template <class _Tp, size_t _Extent>
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inline constexpr bool ranges::enable_borrowed_range<span<_Tp, _Extent> > = true;
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#endif // !defined(_LIBCPP_HAS_NO_RANGES)
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// as_bytes & as_writable_bytes
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template <class _Tp, size_t _Extent>
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_LIBCPP_INLINE_VISIBILITY

‎libcxx/include/string_view

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template<class charT, class traits = char_traits<charT>>
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class basic_string_view;
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template<class charT, class traits>
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inline constexpr bool ranges::enable_borrowed_range<basic_string_view<charT, traits>> = true; // C++20
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// 7.9, basic_string_view non-member comparison functions
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template<class charT, class traits>
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constexpr bool operator==(basic_string_view<charT, traits> x,
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*/
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#include <__config>
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#include <__ranges/enable_borrowed_range.h>
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#include <__string>
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#include <iosfwd>
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#include <algorithm>
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size_type __size;
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};
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#if _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_RANGES)
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template <class _CharT, class _Traits>
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inline constexpr bool ranges::enable_borrowed_range<basic_string_view<_CharT, _Traits> > = true;
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#endif // _LIBCPP_STD_VER > 17 && !defined(_LIBCPP_HAS_NO_RANGES)
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// [string.view.comparison]
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// operator ==

‎libcxx/test/libcxx/double_include.sh.cpp

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#endif
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#include <queue>
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#include <random>
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#include <ranges>
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#include <ratio>
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#ifndef _LIBCPP_HAS_NO_LOCALIZATION
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# include <regex>

‎libcxx/test/libcxx/inclusions/ranges.inclusions.compile.pass.cpp

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//===----------------------------------------------------------------------===//
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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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//
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// WARNING: This test was generated by generate_header_inclusion_tests.py
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// and should not be edited manually.
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//
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// clang-format off
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// UNSUPPORTED: c++03, c++11, c++14, c++17
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// <ranges>
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// Test that <ranges> includes all the other headers it's supposed to.
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#include <ranges>
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#include "test_macros.h"
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#if !defined(_LIBCPP_RANGES)
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# error "<ranges> was expected to define _LIBCPP_RANGES"
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#endif
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#if TEST_STD_VER > 17 && !defined(_LIBCPP_COMPARE)
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# error "<ranges> should include <compare> in C++20 and later"
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#endif
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#if TEST_STD_VER > 03 && !defined(_LIBCPP_INITIALIZER_LIST)
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# error "<ranges> should include <initializer_list> in C++20 and later"
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#endif
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#if !defined(_LIBCPP_ITERATOR)
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# error "<ranges> should include <iterator> in C++20 and later"
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#endif

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