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DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam with TArray

How can I use DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam with TArray parameter? I can use it with the other common types, but I cannot use with TArray.

 // e.g.
 DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam( FGenerateMyDataDelegate, TArray< uint8 >, MyData );

I can compile(build) the source. But it will occur an error in compiling a blueprint. The error is below:

 LogBlueprint: Error: [Compiler VW0_BP] Generate My Data  Signature Error: The function/event 'OnSuccess_C9A93DFE4DF51C0C6C9496873C6AAC62' does not match the necessary signature - has the delegate or function/event changed?
 LogBlueprint: Error: [Compiler VW0_BP] Generate My Data  Signature Error: The function/event 'OnFail_C9A93DFE4DF51C0C6C9496873C6AAC62' does not match the necessary signature - has the delegate or function/event changed?

I can compile a blueprint if use a USTRUCT wrapper instead a TArray. And I can compile if the other type something like UTexture too.

Is it a bug or the specification? If you know how to use a Tarray directly then tell me please it.

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Product Version: UE 4.19
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asked Aug 16 '18 at 09:12 AM in Using UE4

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usagi-wrp
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1 answer: sort voted first

Try passing the array as a const reference

 DECLARE_DYNAMIC_MULTICAST_DELEGATE_OneParam(FGenerateMyDataDelegate, const TArray<uint8>&, MyData);
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answered Aug 16 '18 at 10:06 AM

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avatar image usagi-wrp Aug 16 '18 at 06:37 PM

It's a cool answer! Thank you.

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