diff options
Diffstat (limited to 'graph/src/lib.rs')
| -rw-r--r-- | graph/src/lib.rs | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/graph/src/lib.rs b/graph/src/lib.rs index d4f6d7c..79f9646 100644 --- a/graph/src/lib.rs +++ b/graph/src/lib.rs @@ -239,11 +239,20 @@ pub trait LabelGraph<T: GraphLabel>: Graph { Self: 'a, T: 'a; + /// Query the graph for a label, and return the node index if + /// found. + /// + /// The default implementation always returns `None`. + #[inline] + fn query_label(&self, _label: T) -> Option<usize> { + None + } + #[inline] /// Return the label of a vertex or an error if the node is /// invalid. /// - /// The default implementation always returns None for a valid + /// The default implementation always returns `None` for a valid /// node. fn vertex_label(&self, node_id: usize) -> Result<Option<T>, Error> { if self.has_node(node_id) { |