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std::layout_left::mapping(3) C++ Standard Libary std::layout_left::mapping(3) NAME std::layout_left::mapping - std::layout_left::mapping Synopsis Defined in header <mdspan> template< class Extents > (since C++23) class layout_left::mapping; The class template layout_left::mapping controls how multidimen- sional indices are mapped in a column-major manner to a one-dimensional value repre- senting 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 Trivially- Copyable 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 determines if this mapping is unique (every combination of [static] indexes maps to a different underlying element) (public static member function) is_exhaustive determines if this mapping is exhaustive (every underlying [static] element can be accessed with some combination of indexes) (public static member function) is_strided determines if this mapping is unique (every combination of [static] indexes maps to a different underlying element) (public static member function) is_always_unique determines if this layout mapping is always unique [static] (public static member function) is_always_exhaustive determines if this layout mapping is always ex- haustive [static] (public static member function) is_always_strided determines if this layout mapping is always strided [static] (public static member function) stride obtains the stride along the specified dimen- sion (public member function) Non-member functions compares this layout mapping with other operator== mapping (function template) submdspan_mapping(std::layout_left::mapping) calculates the mapping and data handle (C++26) offset used for sub- dmspan (public member func- tion) 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) http://cppreference.com 2024.06.10 std::layout_left::mapping(3)
NAME | Synopsis | Template parameters | Member types | Member objects | Member functions | Observers | Non-member functions | See also
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