Using Function Pointer as parameter raises error

Development Programming & Scripting
1

Hey all!

So I am using a method which uses a Function Pointer as an input parameter.

This is how the declaration and definition look like:

.h

UFUNCTION()
		bool PerformTask(void (AItem::*FunctioPtr)(), uint8 Priority, float Length, bool bSuspendEqualPriority = false);

.cpp

 bool AItem::PerformTask(void (AItem::*FunctioPtr)(), uint8 Priority, float Length, bool bSuspendEqualPriority)
    {
    	//...
    }

This setup worked in a prior project, but now it raises a “Unrecognized type ‘void’” error.
Why is this happening and how could I resolve it?

Thanks!

2

#UFUNCTION() ?

Does your function have to be UFUNCTION()?

Does it compile if you dont use UFUNCTION() ?

Let us know!

Rama

3

Omitting the UFUNCTION() declaration did actually solve the problem!

Thanks Rama, also for your article about function pointers!

4

Greetings, guys. I’ve got similar question.
So is it possible somehow to use function pointers with UFUNCTION macro to call them from blueprints?

5

I don’t think that’s possible. However you could use the function name as a parameter (the function to call needs to be a UFUNCTION too) and then execute that function via ProcessEvent(FindFunction(FunctionName), NULL) on a UObject derived object.

6

Thanks, Fluppi, I think that it should work in my case. At least I will try :slight_smile:

7

I got this syntax compiling for function declaration, but not sure exactly how to call the function passed in as the parameter. Any ideas?

void APFCharacter::Exclaim(void (APFCharacter::*ExclaimFunc)(void))
{
	(this->*ExclaimFunc())();
}

Here’s the error:

12>C:\UnrealEngine\Prizefighter\Source\Prizefighter\Private\PFCharacter.cpp(719): error C2064: term does not evaluate to a function taking 0 arguments