Added required singleton

mi-squared · Mar 16, 2021 · 27e9143 · 27e9143
1 parent c85ed28
commit 27e9143
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/lib/util/counter.rb b/lib/util/counter.rb
@@ -1,3 +1,5 @@
+require 'singleton'
+
 module HQMF
   # Simple class to issue monotonically increasing integer identifiers
   class InstanceCounter