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

Since C++23

Returns the number of dynamic dimensions in extents.

# Declarations

static constexpr rank_type rank_dynamic() const noexcept;

(since C++23)

# Return value

The number of dynamic dimensions.

# Example

#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';
}

# See also