support lambda functions in delegates

General Feedback & Requests
2

You can actually use lambdas already with UE4 delegates, as long as you don’t capture variables with your lambda. Here is an example from some Slate UI.


	
SNew(SImage)
	.Image( FEditorStyle::GetBrush("EditorLiveStreaming.BroadcastButton") )
	.ColorAndOpacity_Static( ] 
	{ 
		FSlateColor Color = FLinearColor( 1.0f, 1.0f, 1.0f, FMath::MakePulsatingValue( FSlateApplication::Get().GetCurrentTime(), 2.0f ) );
		return Color;
	} )

For timelines, you would use syntax like:


	
MyDelegate = FOnTimelineEvent::CreateStatic( ] { DoSomething(); } );

In 4.6 we will have support for stateful lambdas as well, by using the new “FMyDelegate::CreateLambda()” functions that we’ve added. Hope that helps!

–Mike