Method find_child

rust/src/tree_structure.rs:219–224

Find the child index and `NodeRef` for `key` in the specified branch, returning `None` if the branch does not exist or index is out of range.

(&self, branch_id: NodeId, key: &K)

    /// Find the child index and `NodeRef` for `key` in the specified branch,
    /// returning `None` if the branch does not exist or index is out of range.
    pub fn find_child(&self, branch_id: NodeId, key: &K) -> Option<(usize, NodeRef<K, V>)> {
        self.get_branch(branch_id).and_then(|branch| {
            let idx = branch.find_child_index(key);
            branch.children.get(idx).cloned().map(|child| (idx, child))
        })
    }

    /// Mutable version of `find_child`.
    pub fn find_child_mut(&mut self, branch_id: NodeId, key: &K) -> Option<(usize, NodeRef<K, V>)> {