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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 | // Kokkos v. 4.0 |
| 9 | // Copyright (2022) National Technology & Engineering |
| 10 | // Solutions of Sandia, LLC (NTESS). |
| 11 | // |
| 12 | // Under the terms of Contract DE-NA0003525 with NTESS, |
| 13 | // the U.S. Government retains certain rights in this software. |
| 14 | // |
| 15 | //===---------------------------------------------------------------------===// |
| 16 | |
| 17 | #ifndef _LIBCPP___MDSPAN_DEFAULT_ACCESSOR_H |
| 18 | #define _LIBCPP___MDSPAN_DEFAULT_ACCESSOR_H |
| 19 | |
| 20 | #include <__config> |
| 21 | #include <__cstddef/size_t.h> |
| 22 | #include <__type_traits/is_abstract.h> |
| 23 | #include <__type_traits/is_array.h> |
| 24 | #include <__type_traits/is_convertible.h> |
| 25 | #include <__type_traits/remove_const.h> |
| 26 | |
| 27 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
| 28 | # pragma GCC system_header |
| 29 | #endif |
| 30 | |
| 31 | _LIBCPP_PUSH_MACROS |
| 32 | #include <__undef_macros> |
| 33 | |
| 34 | _LIBCPP_BEGIN_NAMESPACE_STD |
| 35 | |
| 36 | #if _LIBCPP_STD_VER >= 23 |
| 37 | |
| 38 | template <class _ElementType> |
| 39 | struct default_accessor { |
| 40 | static_assert(!is_array_v<_ElementType>, "default_accessor: template argument may not be an array type"); |
| 41 | static_assert(!is_abstract_v<_ElementType>, "default_accessor: template argument may not be an abstract class"); |
| 42 | |
| 43 | using offset_policy = default_accessor; |
| 44 | using element_type = _ElementType; |
| 45 | using reference = _ElementType&; |
| 46 | using data_handle_type = _ElementType*; |
| 47 | |
| 48 | _LIBCPP_HIDE_FROM_ABI constexpr default_accessor() noexcept = default; |
| 49 | template <class _OtherElementType> |
| 50 | requires(is_convertible_v<_OtherElementType (*)[], element_type (*)[]>) |
| 51 | _LIBCPP_HIDE_FROM_ABI constexpr default_accessor(default_accessor<_OtherElementType>) noexcept {} |
| 52 | |
| 53 | _LIBCPP_HIDE_FROM_ABI constexpr reference access(data_handle_type __p, size_t __i) const noexcept { return __p[__i]; } |
| 54 | _LIBCPP_HIDE_FROM_ABI constexpr data_handle_type offset(data_handle_type __p, size_t __i) const noexcept { |
| 55 | return __p + __i; |
| 56 | } |
| 57 | }; |
| 58 | |
| 59 | #endif // _LIBCPP_STD_VER >= 23 |
| 60 | |
| 61 | _LIBCPP_END_NAMESPACE_STD |
| 62 | |
| 63 | _LIBCPP_POP_MACROS |
| 64 | |
| 65 | #endif // _LIBCPP___MDSPAN_DEFAULT_ACCESSOR_H |
| 66 |
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