v0.2.55..v0.2.56 changeset MinIdVisitor.h

diff --git a/hoot-core/src/main/cpp/hoot/core/visitors/MinIdVisitor.h b/hoot-core/src/main/cpp/hoot/core/visitors/MinIdVisitor.h
index 344bdac..dca7b8a 100644
--- a/hoot-core/src/main/cpp/hoot/core/visitors/MinIdVisitor.h
+++ b/hoot-core/src/main/cpp/hoot/core/visitors/MinIdVisitor.h
@@ -47,7 +47,8 @@ public:
 
   static std::string className() { return "hoot::MinIdVisitor"; }
 
-  MinIdVisitor() : _minId(std::numeric_limits<long>::max()) {}
+  MinIdVisitor() : _minId(std::numeric_limits<long>::max()) { }
+  virtual ~MinIdVisitor() = default;
 
   long getMinId() const { return _minId; }