std::extents<IndexType,Extents...>::rank

 

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std::mdspan

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mdspan::is_uniquemdspan::is_exhaustivemdspan::is_stridedmdspan::is_always_uniquemdspan::is_always_exhaustivemdspan::is_always_strided (C++23)(C++23)(C++23)(C++23)(C++23)(C++23)

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extentsdextents (C++23)(C++23)

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static constexpr rank_type rank() const noexcept;		(since C++23)

Returns the number of dimensions in extents.

Parameters

(none)

Return value

The number of dimensions.

Example

Run this code

#include <iostream>
#include <mdspan>
 
int main()
{
    std::extents<int, 1, 2> e1;
    std::extents<int, 3, 4, std::dynamic_extent> e2(5);
    std::cout << e1.rank() << ", " << e2.rank() << '\n';
}

Output:

2, 3

See also

rank_dynamic [static]	returns the dynamic rank of an extents (public static member function)
rank (C++11)	obtains the number of dimensions of an array type (class template)