Function select_nodes

pub fn select_nodes<'a, T, Func, V, B>(
    root: &'a ParentNode<T>,
    func: &Func,
    visitor: &mut V,
) -> ControlFlow<B>
where
    T: RTreeObject,
    Func: SelectionFunction<T>,
    V: FnMut(&'a T) -> ControlFlow<B>,

Internal iteration variant of SelectionIterator