[4.6.1] Returning reference to structure gives error

Development Programming & Scripting Blueprint
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9

While this may work, it shouldn’t be this way. You should be able to return a const reference from a function. If the blueprint system then chooses to copy this into a new non-const/ref structure, so be it, the inefficiencies of BP climb.

The problem lies here:

		const bool bOutParam = (Property->HasAnyPropertyFlags(CPF_OutParm | CPF_ReturnParm) && !(Property->HasAnyPropertyFlags(CPF_ReferenceParm)));

		if ( ((SourcePin->Direction == EGPD_Input) && bOutParam) || ((SourcePin->Direction == EGPD_Output) && !bOutParam))
		{
			MessageLog.Error(*FString::Printf(*LOCTEXT("DirectionMismatchParameter_Error", "The direction of @@ doesn't match the direction of parameter %s").ToString(), *Property->GetName()), SourcePin);
		}

An an out param (i.e. return value) cannot be a reference, const or not, which is entirely silly.