forked from OSchip/llvm-project
133 lines
3.8 KiB
C++
133 lines
3.8 KiB
C++
// -*- C++ -*-
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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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#ifndef _LIBCPP___RANGES_SIZE_H
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#define _LIBCPP___RANGES_SIZE_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 <__ranges/access.h>
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#include <__utility/__decay_copy.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_PUSH_MACROS
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#include <__undef_macros>
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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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template<class>
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inline constexpr bool disable_sized_range = false;
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// [range.prim.size]
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namespace __size {
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void size(auto&) = delete;
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void size(const auto&) = delete;
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template <class _Tp>
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concept __size_enabled = !disable_sized_range<remove_cvref_t<_Tp>>;
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template <class _Tp>
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concept __member_size = __size_enabled<_Tp> && requires(_Tp&& __t) {
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{ _VSTD::__decay_copy(_VSTD::forward<_Tp>(__t).size()) } -> __integer_like;
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};
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template <class _Tp>
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concept __unqualified_size =
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__size_enabled<_Tp> &&
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!__member_size<_Tp> &&
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__class_or_enum<remove_cvref_t<_Tp>> &&
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requires(_Tp&& __t) {
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{ _VSTD::__decay_copy(size(_VSTD::forward<_Tp>(__t))) } -> __integer_like;
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};
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template <class _Tp>
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concept __difference =
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!__member_size<_Tp> &&
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!__unqualified_size<_Tp> &&
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__class_or_enum<remove_cvref_t<_Tp>> &&
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requires(_Tp&& __t) {
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{ ranges::begin(__t) } -> forward_iterator;
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{ ranges::end(__t) } -> sized_sentinel_for<decltype(ranges::begin(declval<_Tp>()))>;
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};
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struct __fn {
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template <class _Tp, size_t _Sz>
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[[nodiscard]] constexpr size_t operator()(_Tp (&&)[_Sz]) const noexcept {
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return _Sz;
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}
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template <class _Tp, size_t _Sz>
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[[nodiscard]] constexpr size_t operator()(_Tp (&)[_Sz]) const noexcept {
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return _Sz;
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}
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template <__member_size _Tp>
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[[nodiscard]] constexpr __integer_like auto operator()(_Tp&& __t) const
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noexcept(noexcept(_VSTD::forward<_Tp>(__t).size())) {
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return _VSTD::forward<_Tp>(__t).size();
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}
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template <__unqualified_size _Tp>
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[[nodiscard]] constexpr __integer_like auto operator()(_Tp&& __t) const
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noexcept(noexcept(size(_VSTD::forward<_Tp>(__t)))) {
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return size(_VSTD::forward<_Tp>(__t));
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}
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template<__difference _Tp>
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[[nodiscard]] constexpr __integer_like auto operator()(_Tp&& __t) const
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noexcept(noexcept(ranges::end(__t) - ranges::begin(__t))) {
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return _VSTD::__to_unsigned_like(ranges::end(__t) - ranges::begin(__t));
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}
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};
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} // end namespace __size
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inline namespace __cpo {
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inline constexpr auto size = __size::__fn{};
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} // namespace __cpo
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namespace __ssize {
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struct __fn {
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template<class _Tp>
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requires requires (_Tp&& __t) { ranges::size(__t); }
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[[nodiscard]] constexpr integral auto operator()(_Tp&& __t) const
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noexcept(noexcept(ranges::size(__t))) {
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using _Signed = make_signed_t<decltype(ranges::size(__t))>;
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if constexpr (sizeof(ptrdiff_t) > sizeof(_Signed))
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return static_cast<ptrdiff_t>(ranges::size(__t));
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else
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return static_cast<_Signed>(ranges::size(__t));
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}
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};
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}
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inline namespace __cpo {
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inline constexpr const auto ssize = __ssize::__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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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___RANGES_SIZE_H
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