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#[doc(hidden)]
#[macro_export]
macro_rules! generate_within_unsorted_iter {
($comments:tt) => {
doc_comment! {
concat!$comments,
#[inline]
pub fn within_unsorted_iter<D>(
&'a self,
query: &'a [A; K],
dist: A,
) -> WithinUnsortedIter<'a, A, T>
where
D: DistanceMetric<A, K>,
{
let mut off = [A::zero(); K];
let gen = Gn::new_scoped(move |gen_scope| {
unsafe {
self.within_unsorted_iter_recurse::<D>(
query,
dist,
self.root_index,
0,
gen_scope,
&mut off,
A::zero(),
);
}
done!();
});
WithinUnsortedIter::new(gen)
}
#[allow(clippy::too_many_arguments)]
unsafe fn within_unsorted_iter_recurse<'scope, D>(
&'a self,
query: &[A; K],
radius: A,
curr_node_idx: IDX,
split_dim: usize,
mut gen_scope: Scope<'scope, 'a, (), NearestNeighbour<A, T>>,
off: &mut [A; K],
rd: A,
) -> Scope<'scope, 'a, (), NearestNeighbour<A, T>>
where
D: DistanceMetric<A, K>,
{
if is_stem_index(curr_node_idx) {
let node = self.stems.get_unchecked(curr_node_idx.az::<usize>());
let mut rd = rd;
let old_off = off[split_dim];
let new_off = query[split_dim].saturating_dist(node.split_val);
let [closer_node_idx, further_node_idx] =
if *query.get_unchecked(split_dim) < node.split_val {
[node.left, node.right]
} else {
[node.right, node.left]
};
let next_split_dim = (split_dim + 1).rem(K);
gen_scope = self.within_unsorted_iter_recurse::<D>(
query,
radius,
closer_node_idx,
next_split_dim,
gen_scope,
off,
rd,
);
rd = Axis::rd_update(rd, D::dist1(new_off, old_off));
if rd <= radius {
off[split_dim] = new_off;
gen_scope = self.within_unsorted_iter_recurse::<D>(
query,
radius,
further_node_idx,
next_split_dim,
gen_scope,
off,
rd,
);
off[split_dim] = old_off;
}
} else {
let leaf_node = self
.leaves
.get_unchecked((curr_node_idx - IDX::leaf_offset()).az::<usize>());
leaf_node
.content_points
.iter()
.enumerate()
.take(leaf_node.size.az::<usize>())
.for_each(|(idx, entry)| {
let distance = D::dist(query, entry);
if distance < radius {
gen_scope.yield_with(NearestNeighbour {
distance,
item: *leaf_node.content_items.get_unchecked(idx.az::<usize>()),
});
}
});
}
gen_scope
}
}
};
}