Function h3ron::iter::neighbors_within_distance_window_or_default

pub fn neighbors_within_distance_window_or_default<'a, I, F, T>(
    cell_iter: I,
    get_cell_value_fn: F,
    k_min: u32,
    k_max: u32,
    neighbor_default_value: Option<&'a T>
) -> Result<CellNeighborsIterator<'a, I, F, T>, Error>
where
    I: Iterator,
    I::Item: Borrow<H3Cell> + 'a,
    F: Fn(&H3Cell) -> Option<&'a T> + 'a,

Returns an iterator to visit all neighbors of the cells of cell_iter by accessing the values using the get_cell_value_fn function. Neighbors of cells which do not have a value returned by that function will not be visited.

The neighbor_default_value will be returned for neighbor cells which are not found by get_cell_value_fn. In case neighbor_default_value is None, that neighbor will be skipped.

k_min and k_max control the radius in which the neighbors will be iterated. Also see H3Cell::grid_disk.

This implementation trys to avoid memory allocations during iteration.