[Idea] Struct Updater POC #1673
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A sketch for updating structs using a
swapconstruct with pattern syntax.As a usage example, lets say we really don't like the Z-axis and want to rid all our lines of it:
COALTON-USER> (coalton-toplevel (define-type Point (Point2 Integer Integer) (Point3 Integer Integer Integer)) (define-struct Line (a Point) (b Point)) (define (no-z-allowed ln) (swap ln (Line (Point3 _ _ 0) (Point3 _ _ 0)) (Line (Point3 _ _ 0) _) (Line _ (Point3 _ _ 0)) _))) ; No values COALTON-USER> (coalton (no-z-allowed (Line (Point3 1 2 3) (Point2 1 1)))) #.(LINE #.(POINT3 1 2 0) #.(POINT2 1 1))As shown, it works with nested types and anonymous fields.
There are some issues with just using patterns as they are, for example, if we wanted to write
(+ 1 -1)instead of0, we can't do that yet because it is not pattern syntax.Let me know if you guys think this is worth investigating.