Clean up some unnecessary references

tree/src/lib.rs

@@ -27,7 +27,7 @@ impl<T> Tree<T> {
     }
 
     /// Use a breadth-first-search pattern to find a node, returning the node if found.
-    pub fn find_bfs<'a, F>(&'a self, op: F) -> Option<Node<T>>
+    pub fn find_bfs<F>(&self, op: F) -> Option<Node<T>>
     where
         F: FnOnce(&T) -> bool + Copy,
     {
@@ -84,14 +84,15 @@ impl<T> Node<T> {
         })))
     }
 
-    // I am copying the value because I don't have a mechanism for keeping the borrow ref active.
-    // My next step is to figure out how to keep the borrow ref active so that I don't have to
-    // clone the item. Then I could drop the Clone constraint.
-    pub fn value<'a>(&'a self) -> Ref<T> {
+    /// Immutably retrieve the data in this node.
+    pub fn value<'a>(&self) -> Ref<T> {
+        // Ref::map is not actually a member function. I don't know why this was done, other than
+        // maybe to avoid conflicting with other `map` declarations. Why that is necessary when
+        // Option::map exists as a member, I don't know.
         Ref::map(self.0.borrow(), |v| &v.value)
     }
 
-    pub fn children<'a>(&'a self) -> Ref<Vec<Node<T>>> {
+    pub fn children<'a>(&self) -> Ref<Vec<Node<T>>> {
         Ref::map(self.0.borrow(), |v| &v.children)
     }