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| 1 | // -*- C++ -*- |
|---|---|
| 2 | //===----------------------------------------------------------------------===// |
| 3 | // |
| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 5 | // See https://llvm.org/LICENSE.txt for license information. |
| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | |
| 10 | #ifndef _LIBCPP___ITERATOR_SIZE_H |
| 11 | #define _LIBCPP___ITERATOR_SIZE_H |
| 12 | |
| 13 | #include <__config> |
| 14 | #include <__cstddef/ptrdiff_t.h> |
| 15 | #include <__cstddef/size_t.h> |
| 16 | #include <__type_traits/common_type.h> |
| 17 | #include <__type_traits/make_signed.h> |
| 18 | |
| 19 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 20 | # pragma GCC system_header |
| 21 | #endif |
| 22 | |
| 23 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 24 | |
| 25 | #if _LIBCPP_STD_VER >= 17 |
| 26 | |
| 27 | template <class _Cont> |
| 28 | _LIBCPP_HIDE_FROM_ABI constexpr auto size(const _Cont& __c) noexcept(noexcept(__c.size())) -> decltype(__c.size()) { |
| 29 | return __c.size(); |
| 30 | } |
| 31 | |
| 32 | template <class _Tp, size_t _Sz> |
| 33 | _LIBCPP_HIDE_FROM_ABI constexpr size_t size(const _Tp (&)[_Sz]) noexcept { |
| 34 | return _Sz; |
| 35 | } |
| 36 | |
| 37 | # if _LIBCPP_STD_VER >= 20 |
| 38 | template <class _Cont> |
| 39 | _LIBCPP_HIDE_FROM_ABI constexpr auto |
| 40 | ssize(const _Cont& __c) noexcept(noexcept(static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>( |
| 41 | __c.size()))) -> common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>> { |
| 42 | return static_cast<common_type_t<ptrdiff_t, make_signed_t<decltype(__c.size())>>>(__c.size()); |
| 43 | } |
| 44 | |
| 45 | // GCC complains about the implicit conversion from ptrdiff_t to size_t in |
| 46 | // the array bound. |
| 47 | _LIBCPP_DIAGNOSTIC_PUSH |
| 48 | _LIBCPP_GCC_DIAGNOSTIC_IGNORED("-Wsign-conversion") |
| 49 | template <class _Tp, ptrdiff_t _Sz> |
| 50 | _LIBCPP_HIDE_FROM_ABI constexpr ptrdiff_t ssize(const _Tp (&)[_Sz]) noexcept { |
| 51 | return _Sz; |
| 52 | } |
| 53 | _LIBCPP_DIAGNOSTIC_POP |
| 54 | # endif |
| 55 | |
| 56 | #endif // _LIBCPP_STD_VER >= 17 |
| 57 | |
| 58 | _LIBCPP_END_NAMESPACE_STD |
| 59 | |
| 60 | #endif // _LIBCPP___ITERATOR_SIZE_H |
| 61 |
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