libcxx/include/__fwd/mdspan.h

   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