autovector: optimize front() and back()

topling · Jun 25, 2022 · 58d069c · 58d069c
1 parent 9d8106d
commit 58d069c
Showing 1 changed file with 4 additions and 4 deletions.
diff --git a/util/autovector.h b/util/autovector.h
@@ -271,22 +271,22 @@ class autovector {
 
   reference front() {
     assert(!empty());
-    return *begin();
+    return values_[0];
   }
 
   const_reference front() const {
     assert(!empty());
-    return *begin();
+    return values_[0];
   }
 
   reference back() {
     assert(!empty());
-    return *(end() - 1);
+    return vect_.empty() ? values_[num_stack_items_-1] : vect_.back();
   }
 
   const_reference back() const {
     assert(!empty());
-    return *(end() - 1);
+    return vect_.empty() ? values_[num_stack_items_-1] : vect_.back();
   }
 
   // -- Mutable Operations