Updated useEvent

src/dawn/state/StateProperty.hpp

@@ -7,8 +7,13 @@
 #include "assert/assert.hpp"
 
 namespace Dawn {
+  class IStateProperty {
+    public:
+      std::vector<std::function<void()>> _effectListners;
+  };
+
   template<class V>
-  class StateProperty {
+  class StateProperty : public IStateProperty {
     private:
       /**
        * Method that is invoked every time that the value of this state property
@@ -31,7 +36,6 @@ namespace Dawn {
 
     public:
       V _realValue;
-      std::vector<std::function<void()>> _effectListners;
       V previous;
 
       /**