Add virtual constructors to abstract classes -- could create memory

leaks

Author: russelltg

src/NodeData.hpp

@@ -16,6 +16,10 @@ struct NodeDataType
 class NODE_EDITOR_PUBLIC NodeData
 {
 public:
+  
+  virtual 
+  ~NodeData() = default;
+  
   virtual bool sameType(NodeData const &nodeData) const
   {
     return (this->type().id == nodeData.type().id);

src/Style.hpp

@@ -4,9 +4,13 @@
 
 class Style
 {
+public:
 
-private:
+  virtual 
+  ~Style() = default;
 
+private:
+  
   virtual void
   loadJsonText(QString jsonText) = 0;