std::layout_left::mapping

 

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std::mdspan

Member functions mdspan::mdspan mdspan::operator= Element access mdspan::operator[] Observers mdspan::rank mdspan::rank_dynamic mdspan::static_extent mdspan::extent mdspan::size mdspan::empty mdspan::stride mdspan::extents mdspan::data_handle mdspan::mapping mdspan::accessor mdspan::is_uniquemdspan::is_exhaustivemdspan::is_stridedmdspan::is_always_uniquemdspan::is_always_exhaustivemdspan::is_always_strided

Non-member functions swap(std::mdspan) Subviews submdspan (C++26) submdspan_extents (C++26) Helper types and templates extentsdextentsdims (C++26) default_accessor Layout mapping policies layout_left layout_right layout_stride layout_left_padded (C++26) layout_right_padded (C++26) Subviews helpers full_extent (C++26) strided_slice (C++26) submdspan_mapping_result (C++26) Deduction guides

 

std::layout_left::mapping

Member functions

mapping::mapping

mapping::operator=

Observers

mapping::extents

mapping::required_span_size

mapping::operator()

mapping::is_uniquemapping::is_exhaustivemapping::is_stridedmapping::is_always_uniquemapping::is_always_exhaustivemapping::is_always_strided

mapping::stride

Non-member functions

operator==

submdspan_mapping(std::layout_left::mapping) (C++26)

 

Defined in header <mdspan>
template< class Extents > class layout_left::mapping;		(since C++23)

The class template layout_left::mapping controls how multidimensional indices are mapped in a column-major manner to a one-dimensional value representing the offset. The mapping has stride 1 at leftmost extent and strides increase left-to-right as the products of extents.

Every specialization of mapping is a LayoutMapping and a TriviallyCopyable type which satisfies regular.

The program is ill-formed if the size of the multidimensional index space Extents() is not representable as a value of type Extents::index_type when Extents::rank_dynamic() is ​0​.

Template parameters

Extents

-

specifies number of dimensions, their sizes, and which are known at compile time. Must be a specialization of std::extents.

Member types

Member type	Definition
extents_type	Extents
index_type	extents_type::index_type
size_type	extents_type::size_type
rank_type	extents_type::rank_type
layout_type	std::layout_left

Member objects

Member name	Definition
extents_ (private)	The extents of type extents_type. (exposition-only member object*)

Member functions

(constructor)	constructs a new mapping (public member function)
operator=	assigns a mapping (public member function)
Observers
extents	obtains the extents object (public member function)
required_span_size	returns the required size of the mapping (public member function)
operator()	maps multidimensional indices into an offset value (public member function)
is_unique [static]	determines if this mapping is unique (every combination of indices maps to a different underlying element) (public static member function)
is_exhaustive [static]	determines if this mapping is exhaustive (every underlying element can be accessed with some combination of indices) (public static member function)
is_strided [static]	determines if this mapping is strided (in each dimension, incrementing an index jumps over the same number of underlying elements every time) (public static member function)
is_always_unique [static]	determines if this layout mapping is always unique (public static member function)
is_always_exhaustive [static]	determines if this layout mapping is always exhaustive (public static member function)
is_always_strided [static]	determines if this layout mapping is always strided (public static member function)
stride	obtains the stride along the specified dimension (public member function)

Non-member functions

operator==	compares this layout mapping with other mapping (function template)
submdspan_mapping(std::layout_left::mapping) (C++26)	calculates the mapping and data handle offset used for subdmspan (public member function)

See also

mapping	a layout mapping of layout_right (public member class template of std::layout_right)
mapping	a layout mapping of layout_stride (public member class template of std::layout_stride)