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No value will be returned by reference

While binding event to delegate broadcast call happening in code, I get the following error: alt text

I think it has to do with the fact I'm returning an array, (saw fixed bugs talking about a NOTE message - not an error) FoundSessions struct:

 // Session result struct
 struct FRedIronSessionResult
     UPROPERTY(EditAnywhere, BlueprintReadWrite)
         FName ServerName;
     UPROPERTY(EditAnywhere, BlueprintReadWrite)
         int32 Ping;
     UPROPERTY(EditAnywhere, BlueprintReadWrite)
         int32 MaxNumberOfPlayers;
     UPROPERTY(EditAnywhere, BlueprintReadWrite)
         int32 CurrentNumberOfPlayers;
     FRedIronSessionResult() {}

The delegate declaration

 DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FFindSessionSuccessDelegateCall, bool, bIsSuccess, TArray<FRedIronSessionResult>, FoundSessions);

The binding inside my class (under public:)

     UPROPERTY(BlueprintAssignable, Category = "Sessions|Delegates")
         FFindSessionSuccessDelegateCall OnFindSessionDone;

The broadcast: (from inside one of the .cpp function)

 TArray<FRedIronSessionResult> SessionResults;
 OnFindSessionDone.Broadcast(false, SessionResults);

What have i done wrong? Thanks

---edit--- Done some more checking - this is happening with every TArray I try to broadcast, not just my struct. Is that a bug or am I using it wrong?

Product Version: UE 4.20
error.png (107.3 kB)
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asked Sep 23 '18 at 11:13 PM in C++ Programming

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GameBit Studios
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avatar image Steven.W Feb 11 '19 at 12:29 PM

I've been getting this in 4.21.2, it was resolved quite some time ago but has reared its head again. https://issues.unrealengine.com/issue/UE-20613

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2 answers: sort voted first

I've solved this by using a wrapper to wrap the array, it looks like a bug.

Marking it as solved, yet, no real reason has been given.

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answered Dec 13 '18 at 11:48 AM

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GameBit Studios
11 3 4

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Are you dragging off the "Event" pin from your "OnFindSessionDone" event and typing "Custom event" to create your custom event with matching signature?

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answered Sep 24 '18 at 08:55 AM

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260 2 4 7

avatar image GameBit Studios Sep 24 '18 at 11:49 AM

Yes I am dragging from the "Event" pin

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