v0.2.55..v0.2.56 changeset CalculateMapBoundsVisitor.h

diff --git a/hoot-core/src/main/cpp/hoot/core/visitors/CalculateMapBoundsVisitor.h b/hoot-core/src/main/cpp/hoot/core/visitors/CalculateMapBoundsVisitor.h
index 4702c8c..1262453 100644
--- a/hoot-core/src/main/cpp/hoot/core/visitors/CalculateMapBoundsVisitor.h
+++ b/hoot-core/src/main/cpp/hoot/core/visitors/CalculateMapBoundsVisitor.h
@@ -45,7 +45,8 @@ public:
 
   static std::string className() { return "hoot::CalculateMapBoundsVisitor"; }
 
-  CalculateMapBoundsVisitor();
+  CalculateMapBoundsVisitor() = default;
+  virtual ~CalculateMapBoundsVisitor() = default;
 
   OGREnvelope getBounds() { return _envelope; }