x

Search in
Sort by:

Question Status:

Search help

  • Simple searches use one or more words. Separate the words with spaces (cat dog) to search cat,dog or both. Separate the words with plus signs (cat +dog) to search for items that may contain cat but must contain dog.
  • You can further refine your search on the search results page, where you can search by keywords, author, topic. These can be combined with each other. Examples
    • cat dog --matches anything with cat,dog or both
    • cat +dog --searches for cat +dog where dog is a mandatory term
    • cat -dog -- searches for cat excluding any result containing dog
    • [cats] —will restrict your search to results with topic named "cats"
    • [cats] [dogs] —will restrict your search to results with both topics, "cats", and "dogs"

Office Holiday

Epic Games' offices will be on holiday from June 22nd to July 7th. During this period support will be limited. Our offices will reopen on Monday, July 8th. 

Adding to multi-cast delegate causing crash

I have declared a multicast delegate like so:

 DECLARE_MULTICAST_DELEGATE(FDelegateType);
 
 FDelegateType MyDelegate;

but when I try to add a function to this delegate

 MyDelegate.AddUObject(this, &SomeClass::SomeFunction);

it causes Unreal to crash with the following error:

 Access violation - code c0000005 (first/second chance not available)
 
 UE4Editor_Unreal!FMulticastDelegateBase<FWeakObjectPtr>::CompactInvocationList() [c:\program files\epic games\ue_4.18\engine\source\runtime\core\public\delegates\multicastdelegatebase.h:159]
 UE4Editor_Unreal!FMulticastDelegateBase<FWeakObjectPtr>::AddInternal() [c:\program files\epic games\ue_4.18\engine\source\runtime\core\public\delegates\multicastdelegatebase.h:146]
 UE4Editor_Unreal!TBaseMulticastDelegate<void>::AddUObject<UHUDScoreBar>() [c:\program files\epic games\ue_4.18\engine\source\runtime\core\public\delegates\delegatesignatureimpl.inl:837]

Specifically, the variable InvocationListLockCount (a mutable int) in MulticastDelegateBase.h has a null value.

It seems as though the delegate has not been initialized, but I am unsure why.

Any help would be appreciated.

Product Version: UE 4.18
Tags:
more ▼

asked Mar 28 '18 at 09:36 AM in C++ Programming

avatar image

jonnybolton42
12 2 4 7

avatar image GigasightMedia Mar 29 '18 at 11:41 AM

Where/when are you binding the delegate?

(comments are locked)
10|2000 characters needed characters left
Viewable by all users

1 answer: sort voted first
more ▼

answered Mar 29 '18 at 02:51 PM

avatar image

42EspoiR
293 11 8 20

(comments are locked)
10|2000 characters needed characters left
Viewable by all users
Your answer
toggle preview:

Up to 5 attachments (including images) can be used with a maximum of 5.2 MB each and 5.2 MB total.

Follow this question

Once you sign in you will be able to subscribe for any updates here

Answers to this question