submdspan_slices.hh

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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
// SPDX-FileCopyrightInfo: Copyright © DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
#ifndef DUNE_COMMON_STD_SUBMDSPAN_SLICES_HH
#define DUNE_COMMON_STD_SUBMDSPAN_SLICES_HH
 
#include <cstddef>
#include <type_traits>
 
#include <dune/common/std/no_unique_address.hh>
 
namespace Dune::Std {
 
struct full_extent_t
{
  explicit full_extent_t () = default;
};
 
inline constexpr full_extent_t full_extent{};
 
template <class OffsetType, class ExtentType, class StrideType>
struct extent_slice
{
  using offset_type = OffsetType;
  using extent_type = ExtentType;
  using stride_type = StrideType;
 
  DUNE_NO_UNIQUE_ADDRESS offset_type offset{};
  DUNE_NO_UNIQUE_ADDRESS extent_type extent{};
  DUNE_NO_UNIQUE_ADDRESS stride_type stride{};
};
 
template <class OffsetType, class ExtentType, class StrideType>
extent_slice(OffsetType, ExtentType, StrideType)
  -> extent_slice<OffsetType,ExtentType,StrideType>;
 
template <class FirstType, class LastType,
          class StrideType = std::integral_constant<std::size_t,1>>
struct range_slice
{
  using first_type = FirstType;
  using last_type = LastType;
  using stride_type = StrideType;
 
  DUNE_NO_UNIQUE_ADDRESS first_type first{};
  DUNE_NO_UNIQUE_ADDRESS last_type last{};
  DUNE_NO_UNIQUE_ADDRESS stride_type stride{};
};
 
template <class FirstType, class LastType>
range_slice(FirstType, LastType)
  -> range_slice<FirstType,LastType>;
 
template <class FirstType, class LastType, class StrideType>
range_slice(FirstType, LastType, StrideType)
  -> range_slice<FirstType,LastType,StrideType>;
 
template <class OffsetType, class ExtentType, class StrideType>
using strided_slice = extent_slice<OffsetType,ExtentType,StrideType>;
 
template <class LayoutMapping>
struct submdspan_mapping_result
{
  DUNE_NO_UNIQUE_ADDRESS LayoutMapping mapping;
  typename LayoutMapping::index_type offset{};
};
 
} // end namespace Dune::Std
 
#endif // DUNE_COMMON_STD_SUBMDSPAN_SLICES_HH