a temporary check point

just to save things in a commit

2 files changed, 9 insertions, 1 deletions

diff --git a/graph/src/adlist.rs b/graph/src/adlist.rs
index c16ceb2..18ad770 100644
--- a/graph/src/adlist.rs
+++ b/graph/src/adlist.rs
@@ -102,6 +102,14 @@ impl ExtGraph for ALGraph {
     }
 }
 
+// TODO: Add a way to build a graph by its raw adjacency list representation.
+impl From<Vec<Vec<usize>>> for ALGraph {
+    fn from(adlist: Vec<Vec<usize>>) -> Self {
+        let nodes: Vec<ALNode> = adlist.iter().cloned().map(ALNode::new).collect();
+        Self { nodes }
+    }
+}
+
 #[cfg(test)]
 mod algraph_test {
     use super::*;
diff --git a/graph/src/labelled.rs b/graph/src/labelled.rs
index 1cb2461..d02e301 100644
--- a/graph/src/labelled.rs
+++ b/graph/src/labelled.rs
@@ -144,7 +144,7 @@ impl<'a> Iterator for LabelIndexIter<'a> {
 
     #[inline]
     fn next(&mut self) -> Option<Self::Item> {
-        self.iter.as_mut().map(|iterator| iterator.next()).flatten()
+        self.iter.as_mut().and_then(|iterator| iterator.next())
     }
 
     #[inline]