a commit before the forst query

I think the main functionalities are already there, but the lack of
querying capabilities makes this not very useful at the moment.

This commit is right before an attempt to add this missing piece.

1 files changed, 9 insertions, 0 deletions

diff --git a/graph/src/labelled/binary.rs b/graph/src/labelled/binary.rs
index 5120522..862f25b 100644
--- a/graph/src/labelled/binary.rs
+++ b/graph/src/labelled/binary.rs
@@ -420,6 +420,11 @@ impl<T: GraphLabel> LabelGraph<T> for PLGraph<T> {
         Self: 'a,
         T: 'a;
 
+    type TupleIter<'a> = std::iter::Empty<(T, usize)>
+    where
+        Self: 'a,
+        T: 'a;
+
     #[inline]
     fn query_label(&self, label: T) -> Option<usize> {
         self.label_index_map.get(&label).copied()
@@ -446,6 +451,10 @@ impl<T: GraphLabel> LabelGraph<T> for PLGraph<T> {
         unimplemented!("Edges have no labels")
     }
 
+    fn tuples_of(&self, _node_id: usize) -> Result<Self::TupleIter<'_>, Error> {
+        unimplemented!("Edges have no labels")
+    }
+
     fn labels_of(&self, _node_id: usize) -> Result<Self::LabelIter<'_>, Error> {
         unimplemented!("Edges have no labels")
     }