C++ named requirements: LayoutMappingPolicy (since C++23)
LayoutMappingPolicy is a type used to specify layout policy of std::mdspan. It provides a member alias template whose specialization is a LayoutMapping type.
Requirements
A type MP satisfies LayoutMappingPolicy if the type requirements shown below are valid:
Legend
| Type | Definition |
|---|---|
MP | a layout mapping policy class |
M | a layout mapping class |
E | a specialization of std::extents |
Type requirements
-
MP::mapping<E> is valid and denotes a type
Mthat satisfies LayoutMapping. -
M::layout_type is valid and denotes a type
MP. -
M::extents_type is valid and denotes a type
E.
Standard library
The following standard library types satisfy LayoutMappingPolicy requirements:
|
(C++23) | column-major multidimensional array layout mapping policy; leftmost extent has stride 1 (class) |
|
(C++23) | row-major multidimensional array layout mapping policy; rightmost extent has stride 1 (class) |
|
(C++23) | a layout mapping policy with user-defined strides (class) |
|
(C++26) | column-major layout mapping policy with padding stride that can be greater than or equal to the leftmost extent (class template) |
|
(C++26) | row-major layout mapping policy with padding stride that can be greater than or equal to the rightmost extent (class template) |
Defined in namespace std::linalg |
|
|---|---|
|
(C++26) |
std::mdspan layout mapping policy that swaps the rightmost two indices, extents, and strides of any unique layout mapping policy (class template) |
|
(C++26) |
std::mdspan layout mapping policy that represents a square matrix that stores only the entries in one triangle, in a packed contiguous format (class template) |
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