How to declare a generic delegate signature as a parameter Unreal/C++?

Development Programming & Scripting C++
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3

Your comments helped and I got it to compile by making it templated method:

	template<class UserClass>
	inline void BindThrottleAction(UInputComponent* PlayerInputComponent, UserClass* Reciever, FEnhancedInputActionHandlerValueSignature::TMethodPtr<UserClass> Signature)
	{
		UEnhancedInputComponent* EnhancedInputComponent = Cast<UEnhancedInputComponent>(PlayerInputComponent);

		if (!ensure(!(EnhancedInputComponent == nullptr))) return;
		if (!ensure(!ThrottleAction)) return;

		EnhancedInputComponent->BindAction(ThrottleAction, ETriggerEvent::Triggered, Reciever, Signature);
		EnhancedInputComponent->BindAction(ThrottleAction, ETriggerEvent::Completed, Reciever, Signature);
	}

And the caller calls it like so:

InputWrapper->BindThrottleAction(PlayerInputComponent, this, &SomePlayerPawn::UpdateThrottle);

But I’m not getting the SomePlayerPawn::UpdateThrottle callback to execute. I think the issue has something to do with referencing the class properties in the template method. I think it’s failing those ensure calls, (or it’s just hanging).~

I then tried to have the template call a private method that then performed the actual work, declared as follows:

void PrivateBindThrottleAction(UInputComponent* PlayerInputComponent, void* Reciever, FEnhancedInputActionHandlerValueSignature* Signature)

And passing using your recommendedFInputActionHandlerWithKeySignature::CreateUObject(). That works perfectly for the signature, BUT the compiler couldn’t resolve passing void * to BindAction().

I then thought of getting a UClass object of the UserClass object and casting the void * using the UClass object. But that doesn’t seem supported.

At this point I’m going to just do something more simple. I think this is too in the C++ weeds for me.

Thanks for the help though! I’d be interested if there were a way to do this.

EDIT: I was wrong. The template was working perfectly fine! I had this ensure backward: if (!ensure(!ThrottleAction)) return; :person_facepalming:

Thanks for the help!