Added reasons to assertions

src/dawn/event/Event.hpp

@@ -32,7 +32,7 @@ namespace Dawn {
      * @param callback Callback method that invokes back.
      */
     EventListener(T *instance, void (T::*callback)(A... args)) {
-      assertNotNull(instance);
+      assertNotNull(instance, "EventListener::EventListener: Instance cannot be null");
 
       this->instance = instance;
       this->callback = callback;
@@ -64,10 +64,10 @@ namespace Dawn {
         T *instance,
         void (T::*callback)(A... args)
       ) {
-        assertNotNull(instance);
+        assertNotNull(instance, "Event::addListener: Instance cannot be null");
 
         auto listener = new EventListener<T,A...>(instance, callback);
-        assertNotNull(listener);
+        assertNotNull(listener, "Event::addListener: Listener could not be created (Memory filled?)");
         this->listeners.push_back(listener);
         return listener;
       }