algo: covers: Make class ApproximateEnhancedCoversCommon abstract

a7f4dab1 · Rajmund Hruška · Tomáš Pecka · b88d915e · a7f4dab1
Commit a7f4dab1 authored 4 years ago by Rajmund Hruška Committed by Tomáš Pecka 4 years ago
--- a/alib2algo/src/stringology/cover/ApproximateEnhancedCoversCommon.h
+++ b/alib2algo/src/stringology/cover/ApproximateEnhancedCoversCommon.h
@@ -14,6 +14,9 @@
 namespace stringology::cover {
  
 class ApproximateEnhancedCoversCommon {
+public:
+	virtual ~ApproximateEnhancedCoversCommon ( ) = 0;
+
 protected:
 	/**
 	 * A simple structure used to represent the element of d-subset corresponding