1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | // -*- C++ -*- //===----------------------------------------------------------------------===// // // 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_SIZE_H #define _LIBCPP___RANGES_SIZE_H #include <__config> #include <__iterator/concepts.h> #include <__iterator/iterator_traits.h> #include <__ranges/access.h> #include <type_traits> #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) #pragma GCC system_header #endif _LIBCPP_PUSH_MACROS #include <__undef_macros> _LIBCPP_BEGIN_NAMESPACE_STD #if !defined(_LIBCPP_HAS_NO_RANGES) // clang-format off namespace ranges { template<class> inline constexpr bool disable_sized_range = false; // [range.prim.size] namespace __size { void size(auto&) = delete; void size(const auto&) = delete; template <class _Tp> concept __size_enabled = !disable_sized_range<remove_cvref_t<_Tp>>; template <class _Tp> concept __member_size = __size_enabled<_Tp> && requires(_Tp&& __t) { { _VSTD::__decay_copy(_VSTD::forward<_Tp>(__t).size()) } -> __integer_like; }; template <class _Tp> concept __unqualified_size = __size_enabled<_Tp> && !__member_size<_Tp> && __class_or_enum<remove_cvref_t<_Tp>> && requires(_Tp&& __t) { { _VSTD::__decay_copy(size(_VSTD::forward<_Tp>(__t))) } -> __integer_like; }; template <class _Tp> concept __difference = !__member_size<_Tp> && !__unqualified_size<_Tp> && __class_or_enum<remove_cvref_t<_Tp>> && requires(_Tp&& __t) { { ranges::begin(__t) } -> forward_iterator; { ranges::end(__t) } -> sized_sentinel_for<decltype(ranges::begin(declval<_Tp>()))>; }; struct __fn { template <class _Tp, size_t _Sz> [[nodiscard]] constexpr size_t operator()(_Tp (&&)[_Sz]) const noexcept { return _Sz; } template <class _Tp, size_t _Sz> [[nodiscard]] constexpr size_t operator()(_Tp (&)[_Sz]) const noexcept { return _Sz; } template <__member_size _Tp> [[nodiscard]] constexpr __integer_like auto operator()(_Tp&& __t) const noexcept(noexcept(_VSTD::forward<_Tp>(__t).size())) { return _VSTD::forward<_Tp>(__t).size(); } template <__unqualified_size _Tp> [[nodiscard]] constexpr __integer_like auto operator()(_Tp&& __t) const noexcept(noexcept(size(_VSTD::forward<_Tp>(__t)))) { return size(_VSTD::forward<_Tp>(__t)); } template<__difference _Tp> [[nodiscard]] constexpr __integer_like auto operator()(_Tp&& __t) const noexcept(noexcept(ranges::end(__t) - ranges::begin(__t))) { return _VSTD::__to_unsigned_like(ranges::end(__t) - ranges::begin(__t)); } }; } // end namespace __size inline namespace __cpo { inline constexpr auto size = __size::__fn{}; } // namespace __cpo namespace __ssize { struct __fn { template<class _Tp> requires requires (_Tp&& __t) { ranges::size(__t); } [[nodiscard]] constexpr integral auto operator()(_Tp&& __t) const noexcept(noexcept(ranges::size(__t))) { using _Signed = make_signed_t<decltype(ranges::size(__t))>; if constexpr (sizeof(ptrdiff_t) > sizeof(_Signed)) return static_cast<ptrdiff_t>(ranges::size(__t)); else return static_cast<_Signed>(ranges::size(__t)); } }; } inline namespace __cpo { inline constexpr const auto ssize = __ssize::__fn{}; } // namespace __cpo } // namespace ranges // clang-format off #endif // !defined(_LIBCPP_HAS_NO_RANGES) _LIBCPP_END_NAMESPACE_STD _LIBCPP_POP_MACROS #endif // _LIBCPP___RANGES_SIZE_H |