std::mdspan<T,Extents,LayoutPolicy,AccessorPolicy>:: extent

From cppreference.com
constexpr index_type extent ( rank_type r ) const noexcept ;
(since C++23)

Returns the extent of a mdspan at the rank index r . Equivalent to return extents ( ) . extent ( r ) ; .

Parameters

r - The rank index to get the extent size of

Return value

The extent at the given rank index.

Example

See also

returns dynamic extent size of an extents at a certain rank index
(public member function of std::extents<IndexType,Extents...> )
returns the static extent size of a mdspan at a given rank index
(public static member function)