dune-common 2.10
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Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy > Class Template Reference

A multi-dimensional non-owning array view. More...

#include <dune/common/std/mdspan.hh>

Public Types

using element_type = Element
 
using extents_type = Extents
 
using layout_type = LayoutPolicy
 
using accessor_type = AccessorPolicy
 
using value_type = std::remove_cv_t<Element>
 
using mapping_type = typename layout_type::template mapping<extents_type>
 
using index_type = typename extents_type::index_type
 
using size_type = typename extents_type::size_type
 
using rank_type = typename extents_type::rank_type
 
using data_handle_type = typename accessor_type::data_handle_type
 
using reference = typename accessor_type::reference
 

Public Member Functions

constexpr const mapping_typemapping () const noexcept
 Index mapping of a layout policy.
 
constexpr const accessor_typeaccessor () const noexcept
 The accessor policy object.
 
constexpr const data_handle_typedata_handle () const noexcept
 The pointer to the underlying flat sequence.
 
constexpr bool is_unique () const
 Return true only if for every i and j where (i != j || ...) => mapping(i...) != mapping(j...).
 
constexpr bool is_exhaustive () const
 Return true only if for all k in the range [0, mapping.required_span_size() ) there exists an i such that mapping(i...) equals k.
 
constexpr bool is_strided () const
 Return true only if for every rank index r of extents there exists an integer sr such that, for all i where (i+dr) is a multidimensional index in extents, mapping((i+dr)...) - mapping(i...) equals sr. *.
 
constexpr index_type stride (rank_type r) const
 The stride along the specified dimension.
 

Static Public Member Functions

static constexpr bool is_always_unique ()
 Return true only if for every i and j where (i != j || ...) => mapping(i...) != mapping(j...).
 
static constexpr bool is_always_exhaustive ()
 Return true only if for all k in the range [0, mapping.required_span_size() ) there exists an i such that mapping(i...) equals k.
 
static constexpr bool is_always_strided ()
 Return true only if for every rank index r of extents there exists an integer sr such that, for all i where (i+dr) is a multidimensional index in extents, mapping((i+dr)...) - mapping(i...) equals sr. *.
 

Related Symbols

(Note that these are not member symbols.)

constexpr const extents_typeextents () const noexcept
 Number of elements in all dimensions of the tensor,.
 

mdspan constructors [mdspan.mdspan.cons]

template<class E = extents_type, class D = data_handle_type, class M = mapping_type, class A = accessor_type, std::enable_if_t<(E::rank_dynamic() > 0), int > = 0, std::enable_if_t< std::is_default_constructible_v< D >, int > = 0, std::enable_if_t< std::is_default_constructible_v< M >, int > = 0, std::enable_if_t< std::is_default_constructible_v< A >, int > = 0>
constexpr mdspan ()
 Default constructor value-initializes all members.
 
template<class... IndexTypes, class E = extents_type, class M = mapping_type, class A = accessor_type, std::enable_if_t<(sizeof...(IndexTypes)==E::rank()||sizeof...(IndexTypes)==E::rank_dynamic()), int > = 0, std::enable_if_t<(... &&std::is_convertible_v< IndexTypes, index_type >), int > = 0, std::enable_if_t<(... &&std::is_nothrow_constructible_v< index_type, IndexTypes >), int > = 0, std::enable_if_t< std::is_constructible_v< M, E >, int > = 0, std::enable_if_t< std::is_default_constructible_v< A >, int > = 0>
constexpr mdspan (data_handle_type p, IndexTypes... exts)
 Construct from the dynamic extents given as variadic list.
 
template<class IndexType , std::size_t N, std::enable_if_t< std::is_convertible_v< const IndexType &, index_type >, int > = 0, std::enable_if_t< std::is_nothrow_constructible_v< index_type, const IndexType & >, int > = 0, std::enable_if_t<(N==extents_type::rank_dynamic()||N==extents_type::rank()), int > = 0>
constexpr mdspan (data_handle_type p, Std::span< IndexType, N > exts)
 Construct from the dynamic extents given as an array.
 
template<class IndexType , std::size_t N, std::enable_if_t< std::is_convertible_v< IndexType, index_type >, int > = 0, std::enable_if_t<(N==extents_type::rank_dynamic()||N==extents_type::rank()), int > = 0>
constexpr mdspan (data_handle_type p, const std::array< IndexType, N > &exts)
 Construct from the dynamic extents given as an array.
 
template<class M = mapping_type, std::enable_if_t< std::is_constructible_v< M, const extents_type & >, int > = 0>
constexpr mdspan (data_handle_type p, const extents_type &e)
 Construct from the pointer to the data of the tensor and its extents.
 
template<class A = accessor_type, std::enable_if_t< std::is_default_constructible_v< A >, int > = 0>
constexpr mdspan (data_handle_type p, const mapping_type &m)
 Construct from the pointer to the data of the tensor and an index mapping.
 
constexpr mdspan (data_handle_type p, const mapping_type &m, const accessor_type &a)
 Construct from the pointer to the data of the tensor, an index mapping, and an accessor.
 
template<class OtherElementType , class OtherExtends , class OtherLayoutPolicy , class OtherAccessor , std::enable_if_t< std::is_constructible_v< mapping_type, const typename OtherElementType::template mapping< OtherExtends > & >, int > = 0, std::enable_if_t< std::is_constructible_v< accessor_type, const OtherAccessor & >, int > = 0>
constexpr mdspan (const mdspan< OtherElementType, OtherExtends, OtherLayoutPolicy, OtherAccessor > &other) noexcept
 Converting constructor.
 

Multi index access

template<class... Indices, std::enable_if_t<(sizeof...(Indices)==extents_type::rank()), int > = 0, std::enable_if_t<(... &&std::is_convertible_v< Indices, index_type >), int > = 0, std::enable_if_t<(... &&std::is_nothrow_constructible_v< index_type, Indices >), int > = 0>
constexpr reference operator() (Indices... indices) const
 Access specified element at position i0,i1,...
 
template<class Index , class E = extents_type, std::enable_if_t< std::is_convertible_v< Index, index_type >, int > = 0, std::enable_if_t<(E::rank()==1), int > = 0>
constexpr reference operator[] (Index index) const
 Access specified element at position [i0] For a rank one mdspan, the operator[i] is added to support bracket access before __cpp_multidimensional_subscript is supported.
 
template<class Index , std::enable_if_t< std::is_convertible_v< const Index &, index_type >, int > = 0, std::enable_if_t< std::is_nothrow_constructible_v< index_type, const Index & >, int > = 0>
constexpr reference operator[] (Std::span< Index, extents_type::rank()> indices) const
 Access specified element at position [i0,i1,...].
 
template<class Index , std::enable_if_t< std::is_convertible_v< const Index &, index_type >, int > = 0, std::enable_if_t< std::is_nothrow_constructible_v< index_type, const Index & >, int > = 0>
constexpr reference operator[] (const std::array< Index, extents_type::rank()> &indices) const
 Access specified element at position [i0,i1,...].
 

Size information

constexpr index_type extent (rank_type r) const noexcept
 Number of elements in the r'th dimension of the tensor.
 
constexpr size_type size () const noexcept
 The number of elements accessible by this multi-dimensional span.
 
constexpr bool empty () const noexcept
 Checks if the size of the index space is zero.
 
static constexpr rank_type rank () noexcept
 Number of dimensions of the tensor.
 
static constexpr rank_type rank_dynamic () noexcept
 Number of dimensions of the tensor.
 
static constexpr std::size_t static_extent (rank_type r) noexcept
 Number of elements in the r'th dimension of the tensor.
 

Detailed Description

template<class Element, class Extents, class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
class Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >

A multi-dimensional non-owning array view.

The class mdspan is a view into a contiguous sequence of objects that reinterprets it as a multidimensional array.

The implementation is based in the standard proposal P0009r17 and the C++ standard working draft N4971.

Example:

std::vector v{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
// view data as contiguous memory representing 2 rows and 5 columns
// with row-major ordering.
auto ms = Dune::Std::mdspan(v.data(), 2, 5);
// write data using 2D view
for (std::size_t i = 0; i != ms.extent(0); i++)
for (std::size_t j = 0; j != ms.extent(1); j++)
ms(i, j) = i + j; // or ms[i, j]
mdspan(CArray &) -> mdspan< std::remove_all_extents_t< CArray >, Std::extents< std::size_t, std::extent_v< CArray, 0 > > >
Note
The interface of Std::mdspan provides the operator[] with multiple indices overload only if available in c++23. For older c++ versions the operator() overload is implemented.
Template Parameters
ElementThe element type; a complete object type that is neither an abstract class type nor an array type.
ExtentsSpecifies number of dimensions, their sizes, and which are known at compile time. Must be a specialization of Std::extents.
LayoutPolicySpecifies how to convert multi-dimensional index to underlying flat index.
AccessorPolicySpecifies how to convert underlying 1D index to a reference to Element.

Member Typedef Documentation

◆ accessor_type

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
using Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::accessor_type = AccessorPolicy

◆ data_handle_type

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
using Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::data_handle_type = typename accessor_type::data_handle_type

◆ element_type

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
using Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::element_type = Element

◆ extents_type

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
using Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::extents_type = Extents

◆ index_type

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
using Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::index_type = typename extents_type::index_type

◆ layout_type

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
using Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::layout_type = LayoutPolicy

◆ mapping_type

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
using Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::mapping_type = typename layout_type::template mapping<extents_type>

◆ rank_type

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
using Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::rank_type = typename extents_type::rank_type

◆ reference

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
using Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::reference = typename accessor_type::reference

◆ size_type

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
using Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::size_type = typename extents_type::size_type

◆ value_type

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
using Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::value_type = std::remove_cv_t<Element>

Constructor & Destructor Documentation

◆ mdspan() [1/8]

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
template<class E = extents_type, class D = data_handle_type, class M = mapping_type, class A = accessor_type, std::enable_if_t<(E::rank_dynamic() > 0), int > = 0, std::enable_if_t< std::is_default_constructible_v< D >, int > = 0, std::enable_if_t< std::is_default_constructible_v< M >, int > = 0, std::enable_if_t< std::is_default_constructible_v< A >, int > = 0>
Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::mdspan ( )
inlineconstexpr

Default constructor value-initializes all members.

◆ mdspan() [2/8]

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
template<class... IndexTypes, class E = extents_type, class M = mapping_type, class A = accessor_type, std::enable_if_t<(sizeof...(IndexTypes)==E::rank()||sizeof...(IndexTypes)==E::rank_dynamic()), int > = 0, std::enable_if_t<(... &&std::is_convertible_v< IndexTypes, index_type >), int > = 0, std::enable_if_t<(... &&std::is_nothrow_constructible_v< index_type, IndexTypes >), int > = 0, std::enable_if_t< std::is_constructible_v< M, E >, int > = 0, std::enable_if_t< std::is_default_constructible_v< A >, int > = 0>
Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::mdspan ( data_handle_type p,
IndexTypes... exts )
inlineexplicitconstexpr

Construct from the dynamic extents given as variadic list.

◆ mdspan() [3/8]

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
template<class IndexType , std::size_t N, std::enable_if_t< std::is_convertible_v< const IndexType &, index_type >, int > = 0, std::enable_if_t< std::is_nothrow_constructible_v< index_type, const IndexType & >, int > = 0, std::enable_if_t<(N==extents_type::rank_dynamic()||N==extents_type::rank()), int > = 0>
Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::mdspan ( data_handle_type p,
Std::span< IndexType, N > exts )
inlineconstexpr

Construct from the dynamic extents given as an array.

◆ mdspan() [4/8]

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
template<class IndexType , std::size_t N, std::enable_if_t< std::is_convertible_v< IndexType, index_type >, int > = 0, std::enable_if_t<(N==extents_type::rank_dynamic()||N==extents_type::rank()), int > = 0>
Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::mdspan ( data_handle_type p,
const std::array< IndexType, N > & exts )
inlineconstexpr

Construct from the dynamic extents given as an array.

◆ mdspan() [5/8]

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
template<class M = mapping_type, std::enable_if_t< std::is_constructible_v< M, const extents_type & >, int > = 0>
Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::mdspan ( data_handle_type p,
const extents_type & e )
inlineconstexpr

Construct from the pointer to the data of the tensor and its extents.

◆ mdspan() [6/8]

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
template<class A = accessor_type, std::enable_if_t< std::is_default_constructible_v< A >, int > = 0>
Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::mdspan ( data_handle_type p,
const mapping_type & m )
inlineconstexpr

Construct from the pointer to the data of the tensor and an index mapping.

◆ mdspan() [7/8]

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::mdspan ( data_handle_type p,
const mapping_type & m,
const accessor_type & a )
inlineconstexpr

Construct from the pointer to the data of the tensor, an index mapping, and an accessor.

◆ mdspan() [8/8]

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
template<class OtherElementType , class OtherExtends , class OtherLayoutPolicy , class OtherAccessor , std::enable_if_t< std::is_constructible_v< mapping_type, const typename OtherElementType::template mapping< OtherExtends > & >, int > = 0, std::enable_if_t< std::is_constructible_v< accessor_type, const OtherAccessor & >, int > = 0>
Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::mdspan ( const mdspan< OtherElementType, OtherExtends, OtherLayoutPolicy, OtherAccessor > & other)
inlineconstexprnoexcept

Converting constructor.

Member Function Documentation

◆ accessor()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
const accessor_type & Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::accessor ( ) const
inlineconstexprnoexcept

The accessor policy object.

◆ data_handle()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
const data_handle_type & Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::data_handle ( ) const
inlineconstexprnoexcept

The pointer to the underlying flat sequence.

◆ empty()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
bool Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::empty ( ) const
inlinenodiscardconstexprnoexcept

Checks if the size of the index space is zero.

◆ extent()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
index_type Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::extent ( rank_type r) const
inlineconstexprnoexcept

Number of elements in the r'th dimension of the tensor.

◆ is_always_exhaustive()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
static constexpr bool Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::is_always_exhaustive ( )
inlinestaticconstexpr

Return true only if for all k in the range [0, mapping.required_span_size() ) there exists an i such that mapping(i...) equals k.

◆ is_always_strided()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
static constexpr bool Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::is_always_strided ( )
inlinestaticconstexpr

Return true only if for every rank index r of extents there exists an integer sr such that, for all i where (i+dr) is a multidimensional index in extents, mapping((i+dr)...) - mapping(i...) equals sr. *.

Note
This implies that for a strided layout mapping(i0, ..., ik) = mapping(0, ..., 0) + i0 * s0 + ... + ik * sk.

◆ is_always_unique()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
static constexpr bool Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::is_always_unique ( )
inlinestaticconstexpr

Return true only if for every i and j where (i != j || ...) => mapping(i...) != mapping(j...).

◆ is_exhaustive()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
bool Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::is_exhaustive ( ) const
inlineconstexpr

Return true only if for all k in the range [0, mapping.required_span_size() ) there exists an i such that mapping(i...) equals k.

◆ is_strided()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
bool Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::is_strided ( ) const
inlineconstexpr

Return true only if for every rank index r of extents there exists an integer sr such that, for all i where (i+dr) is a multidimensional index in extents, mapping((i+dr)...) - mapping(i...) equals sr. *.

Note
This implies that for a strided layout mapping(i0, ..., ik) = mapping(0, ..., 0) + i0 * s0 + ... + ik * sk.

◆ is_unique()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
bool Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::is_unique ( ) const
inlineconstexpr

Return true only if for every i and j where (i != j || ...) => mapping(i...) != mapping(j...).

◆ mapping()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
const mapping_type & Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::mapping ( ) const
inlineconstexprnoexcept

Index mapping of a layout policy.

◆ operator()()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
template<class... Indices, std::enable_if_t<(sizeof...(Indices)==extents_type::rank()), int > = 0, std::enable_if_t<(... &&std::is_convertible_v< Indices, index_type >), int > = 0, std::enable_if_t<(... &&std::is_nothrow_constructible_v< index_type, Indices >), int > = 0>
reference Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::operator() ( Indices... indices) const
inlineconstexpr

Access specified element at position i0,i1,...

Note
The operator() is not in the std proposal, but is provided for using mdspan without c++23.

◆ operator[]() [1/3]

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
template<class Index , std::enable_if_t< std::is_convertible_v< const Index &, index_type >, int > = 0, std::enable_if_t< std::is_nothrow_constructible_v< index_type, const Index & >, int > = 0>
reference Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::operator[] ( const std::array< Index, extents_type::rank()> & indices) const
inlineconstexpr

Access specified element at position [i0,i1,...].

◆ operator[]() [2/3]

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
template<class Index , class E = extents_type, std::enable_if_t< std::is_convertible_v< Index, index_type >, int > = 0, std::enable_if_t<(E::rank()==1), int > = 0>
reference Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::operator[] ( Index index) const
inlineconstexpr

Access specified element at position [i0] For a rank one mdspan, the operator[i] is added to support bracket access before __cpp_multidimensional_subscript is supported.

◆ operator[]() [3/3]

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
template<class Index , std::enable_if_t< std::is_convertible_v< const Index &, index_type >, int > = 0, std::enable_if_t< std::is_nothrow_constructible_v< index_type, const Index & >, int > = 0>
reference Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::operator[] ( Std::span< Index, extents_type::rank()> indices) const
inlineconstexpr

Access specified element at position [i0,i1,...].

◆ rank()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
static constexpr rank_type Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::rank ( )
inlinestaticconstexprnoexcept

Number of dimensions of the tensor.

◆ rank_dynamic()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
static constexpr rank_type Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::rank_dynamic ( )
inlinestaticconstexprnoexcept

Number of dimensions of the tensor.

◆ size()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
size_type Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::size ( ) const
inlineconstexprnoexcept

The number of elements accessible by this multi-dimensional span.

◆ static_extent()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
static constexpr std::size_t Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::static_extent ( rank_type r)
inlinestaticconstexprnoexcept

Number of elements in the r'th dimension of the tensor.

◆ stride()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
index_type Dune::Std::mdspan< Element, Extents, LayoutPolicy, AccessorPolicy >::stride ( rank_type r) const
inlineconstexpr

The stride along the specified dimension.

Friends And Related Symbol Documentation

◆ extents()

template<class Element , class Extents , class LayoutPolicy = Std::layout_right, class AccessorPolicy = Std::default_accessor<Element>>
const extents_type & extents ( ) const
related

Number of elements in all dimensions of the tensor,.


The documentation for this class was generated from the following file: