How to code events in c++?

Development Programming & Scripting
1

Doc from here don’t explain all the process (and don’t compile):
https://docs.unrealengine.com/latest/INT/Programming/UnrealArchitecture/Delegates/Events/index.html

doc there is different :

and code from unreal is different from both :

/** Called when selected level list changes. */
DECLARE_EVENT( UWorld, FOnSelectedLevelsChangedEvent);

/** Broadcasts whenever selected level list changes. */
FOnSelectedLevelsChangedEvent				SelectedLevelsChangedEvent;

So what’s the right way to code events from start to end ?

Thanks.

2

Hey w77, where are you declaring this- is it in an interface?

3

Hey w77

I just tested an event declaration in an interface;

DECLARE_EVENT_OneParam( UActionManager, FEventSignature, AActor* )

in the header;

static FEventSignature MyTestEvent;

In the cpp;

FEventSignature IActionManagerInterface::MyTestEvent = {};

It compiles fine. So then all I’d need to do is bind the event to a function in the UActionManager, which is the class I’ve assigned as the owning type.

MyTestEvent.BindUObject(this, &UActionManager::SomeFunction);

Let me know if that works! If the class you’re declaring it in isnt abstract, then you probably wouldn’t want it to be static.

4

If it isn’t static then don’t put anything in the cpp. you shouldn’t need to initialize it…

5

no, it’s a class event.

6

without static :
error C2761: ‘FDisableEvent UGeneratorComponent::DisableEvent’ : member function redeclaration not allowed

public:
	FDisableEvent DisableEvent;

.cpp

FDisableEvent UGeneratorComponent::DisableEvent = {};

I don’t understand why set the event public… any class anywhere can fire broadcast.

7

you can make it private in the header. The DECLARE_EVENT is above the class definition though. Between the #includes and the class definition…