Mercurial > repos > alg_tools / changeset

--- a/src/mapping.rs	Sun Oct 20 23:53:43 2024 -0500
+++ b/src/mapping.rs	Mon Oct 21 09:11:34 2024 -0500
@@ -118,12 +118,22 @@
 }
 
 
-impl<Domain : Copy, M> Apply<Domain> for Sum<Domain, M>
+impl<Domain, M> Apply<Domain> for Sum<Domain, M>
 where M : Mapping<Domain>,
       M::Codomain : std::iter::Sum {
     type Output = M::Codomain;
 
     fn apply(&self, x : Domain) -> Self::Output {
+        self.components.iter().map(|c| c.apply(&x)).sum()
+    }
+}
+
+impl<'a, Domain, M> Apply<&'a Domain> for Sum<Domain, M>
+where M : Mapping<Domain>,
+      M::Codomain : std::iter::Sum {
+    type Output = M::Codomain;
+
+    fn apply(&self, x : &'a Domain) -> Self::Output {
         self.components.iter().map(|c| c.apply(x)).sum()
     }
 }