lib/d_heap.rb in d_heap-0.3.0 vs lib/d_heap.rb in d_heap-0.4.0

@@ -12,11 +12,13 @@
 # minimum.  Additionally, _d_-ary heaps can have better memory cache behavior than
 # binary heaps, allowing them to run more quickly in practice despite slower
 # worst-case time complexity.
 #
 class DHeap
-
-  def initialize_copy(other)
-    raise NotImplementedError, "initialize_copy should deep copy array"
+  # ruby 3.0+ (2.x can just use inherited initialize_clone)
+  if Object.instance_method(:initialize_clone).arity == -1
+    def initialize_clone(other, freeze: nil)
+      __init_clone__(other, freeze ? true : freeze)
+    end
   end
 
 end