[C++] Delegate Error in 4.16

Development Programming & Scripting
1

I got some strange behaviour in 4.16. I setup a new blank c++ project and implemented everything there from scratch to be a 3rd person template (just to learn what changed etc.).

Now I got everything working, but I encounter a strange error. When I compile the editor in development mode, it triggers the following breakpoint:

ScriptDelegates.h, Line 509:

(void)ensure( InvocationList[ CurFunctionIndex ] != InDelegate );

This is raised by the following function call in my characters BeginPlay method:

void AMyCharacter::BeginPlay()
{
	Super::BeginPlay();
	
	// Subscribe to overlap events
	InteractionSphere->OnComponentBeginOverlap.AddDynamic(this, &AMyCharacter::OnInteractionOverlapBegin);

    // THE END OVERLAP DELEGATE SEEMS TO BE ALREADY BOUND TO THAT EXACT METHOD HERE
	InteractionSphere->OnComponentEndOverlap.AddDynamic(this, &AMyCharacter::OnInteractionOverlapEnd);
}

So, it looks like the call of AddDynamic on OverlapBegin seems to automatically connect the OverlapEnd method, is this correct? And even if this is correct, I find this behaviour extremely untransparent. I tried to comment out the AddDynamic call for the EndOverlap delegate and it really is bound (gets executed when I hit play, and the breakpoint from above is not triggered).

Why is this happening? My character also has a blueprint class, but it does not bind any events on the sphere component.

So, is this a bug or some new “feature”?

2

I encounter the same error when binding to the owning Actor’s OnTakeAnyDamage from component’s OnRegister method. I do unbind this function in OnUnregister, but when I start the editor it seems that when AddDynamic inside OnRegister is called, the function is already bound. Can anyone explain this behavior?