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

 

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

Returns the number of dynamic dimensions in extents.

Parameters

(none)

Return value

The number of dynamic 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::extents<int, std::dynamic_extent, 7, std::dynamic_extent> e3(6, 8);
    std::cout << e1.rank_dynamic() << ", "
              << e2.rank_dynamic() << ", "
              << e3.rank_dynamic() << '\n';
}

Output:

0, 1, 2

See also

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