Method visitor

src/tree/binary/traverse.rs:206–215

(p: Option<NonNull<Node<K, V>>>, results: &mut Vec<K>)

    {
        let mut results = vec![];
        unsafe fn visitor<K, V>(p: Option<NonNull<Node<K, V>>>, results: &mut Vec<K>)
        where
            K: Copy,
        {
            if let Some(node) = p {
                results.push(node.as_ref().key);
                visitor(node.as_ref().left, results);
                visitor(node.as_ref().right, results);
            }
        }
        visitor(tree.root, &mut results);
        results
    }