C++ named requirements: LayoutMappingPolicy (since C++23)

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C++ named requirements

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 M that 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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