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_LAYOUTS_H
18 #define _LIBCPP___MDSPAN_LAYOUTS_H
19 
20 #include <__config>
21 
22 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
23 #  pragma GCC system_header
24 #endif
25 
26 _LIBCPP_PUSH_MACROS
27 #include <__undef_macros>
28 
29 _LIBCPP_BEGIN_NAMESPACE_STD
30 
31 #if _LIBCPP_STD_VER >= 23
32 
33 // Layout policy with a mapping which corresponds to FORTRAN-style array layouts
34 struct layout_left {
35   template <class _Extents>
36   class mapping;
37 };
38 
39 // Layout policy with a mapping which corresponds to C-style array layouts
40 struct layout_right {
41   template <class _Extents>
42   class mapping;
43 };
44 
45 // Layout policy with a unique mapping where strides are arbitrary
46 struct layout_stride {
47   template <class _Extents>
48   class mapping;
49 };
50 
51 #endif // _LIBCPP_STD_VER >= 23
52 
53 _LIBCPP_END_NAMESPACE_STD
54 
55 _LIBCPP_POP_MACROS
56 
57 #endif // _LIBCPP___MDSPAN_LAYOUTS_H
58