question about the order of function execution in unreal

Development Programming & Scripting Blueprint
1

Hi. I’m a bit unsure re: the order of function execution in unreal, specifically when an event is fired within one of the functions.
In img1 there is function 1 and function 2 off event beginplay.
In img2 there is an evt fired from within function 1 and then a print string.

I thought the entire event would complete execution (including the delay) before returning to function 1 and printing the string after event called.
I thought the order of print strings would be:

event called -> event_after_delay -> after_event_called -> last

But when running it was
event called -> after_event_called -> event_after_delay -> last

So basically function one wasn’t waiting for event to be completed before finishing.

Does that mean events are asynchronous?

And I haven’t placed return nodes in the functions because nothing is returned at this stage. Should I be putting return nodes there anyway?

Thanks.

2

Anything after delay only executes after the delay.

Think of the delay as schedule this stuff to occur after the delay.

There is no "waiting " for the event with a delay to finish. Once the delay has scheduled it is done.

3

Thanks but the issue I am unsure about is the print string in function 1 “after event called” is being executed before the event has finished.
I thought what might happen is that the whole event would execute, including the delay, and only then would the print string in function 1 be called.

5

Think about it as if it was not a call to a function, but start of a new, separate thread executing the event code. It is not “start and wait till the execution ends” but just “start”.

6

Delays IN functions only apply to said functions code. Inline delays affect the sequence of execution down the chain.

e.g. Function1 → Delay → Function2 … this results in a delay (wait) before Function2 is executed.