0a5ebc692b
These are specced as `inline constexpr auto`; the extra `const`
isn't doing anything except being inconsistent with the other CPOs.
Now all the implemented CPOs can be detected by
git grep 'inline constexpr auto.*fn' ../libcxx/include/
and I think that's beautiful.
82 lines
2.2 KiB
C++
82 lines
2.2 KiB
C++
// -*- C++ -*-
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//===------------------------ __ranges/data.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_DATA_H
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#define _LIBCPP___RANGES_DATA_H
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#include <__config>
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#include <__iterator/concepts.h>
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#include <__iterator/iterator_traits.h>
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#include <__memory/pointer_traits.h>
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#include <__ranges/access.h>
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#include <__utility/forward.h>
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#include <concepts>
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#include <type_traits>
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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_BEGIN_NAMESPACE_STD
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#if !defined(_LIBCPP_HAS_NO_RANGES)
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// clang-format off
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namespace ranges {
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// [range.prim.data]
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namespace __data {
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template <class _Tp>
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concept __ptr_to_object = is_pointer_v<_Tp> && is_object_v<remove_pointer_t<_Tp>>;
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template <class _Tp>
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concept __member_data =
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requires(_Tp&& __t) {
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{ _VSTD::forward<_Tp>(__t) } -> __can_borrow;
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{ __t.data() } -> __ptr_to_object;
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};
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template <class _Tp>
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concept __ranges_begin_invocable =
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!__member_data<_Tp> &&
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requires(_Tp&& __t) {
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{ _VSTD::forward<_Tp>(__t) } -> __can_borrow;
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{ ranges::begin(_VSTD::forward<_Tp>(__t)) } -> contiguous_iterator;
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};
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struct __fn {
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template <__member_data _Tp>
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requires __can_borrow<_Tp>
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_LIBCPP_HIDE_FROM_ABI
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constexpr __ptr_to_object auto operator()(_Tp&& __t) const
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noexcept(noexcept(__t.data())) {
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return __t.data();
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}
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template<__ranges_begin_invocable _Tp>
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requires __can_borrow<_Tp>
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_LIBCPP_HIDE_FROM_ABI
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constexpr __ptr_to_object auto operator()(_Tp&& __t) const
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noexcept(noexcept(_VSTD::to_address(ranges::begin(_VSTD::forward<_Tp>(__t))))) {
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return _VSTD::to_address(ranges::begin(_VSTD::forward<_Tp>(__t)));
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}
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};
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} // end namespace __data
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inline namespace __cpo {
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inline constexpr auto data = __data::__fn{};
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} // namespace __cpo
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} // namespace ranges
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// clang-format off
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#endif // !defined(_LIBCPP_HAS_NO_RANGES)
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___RANGES_DATA_H
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