kd_tree simplification

mod.rs

mod kd_tree {
    use na::*;
    use na::allocator::Allocator;

    /// kd-Tree implementation structure
    pub(super) enum KdTreeImpl<N> where N: DimName, DefaultAllocator: Allocator<f64, N> {
        Node(usize, Box<KdTreeImpl<N>>, Box<VectorN<f64, N>>, Box<KdTreeImpl<N>>),
        Empty()
    }

    impl<N> KdTreeImpl<N> where N: DimName, DefaultAllocator: Allocator<f64, N> {
        /// mutably enunerate points from a kd tree into a vector - TODO: expose as iterator instead?
        pub fn add_points_to_vector(&self, pts : &mut Vec<VectorN<f64, N>>) {
            if let KdTreeImpl::Node(_, l, pt, r) = *self {
                l.add_points_to_vector(pts);
                pts.push(*pt);
                r.add_points_to_vector(pts);
            }
        }
    }
}