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Why abstract forwarding is needed?


(Michael Solomon) #1

Why we need explicitly declare that we want to @:forward the base type functionality to the abstract?

  1. Isn’t the haxe compiler can figure it out by itself that we use X base-type function?
  2. Why not just always forward all functionality to the abstract type, anyway abstracts not exist in the output

(Jens Fischer) #2

You might not always want to have the methods of the underlying type available. For instance, you can use this to implement a read-only / immutable array, by forwarding only those methods that don’t modify it:

Another reason might be that you want to implement a method with the same name as an already existing one on the underlying type, but use a different signature for it. Since Haxe doesn’t have overloading, “auto-forwarding” like you propose would lead to a clash.