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Add example of struct subtype inheritance of supertype. Clarify struct subtype inherits the prefix of the struct supertype.

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Mark Lee 2015-04-30 14:22:37 -04:00 committed by Matthew Flatt
parent ed0e98b305
commit c44cffe5a8
1 changed files with 4 additions and 1 deletions
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5
pkgs/racket-doc/scribblings/guide/define-struct.scrbl
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@ -136,8 +136,11 @@ supertype.
(define p (3d-posn 1 2 3))
p
(posn? p)
(posn-x p)
(3d-posn-z p)
(code:comment "a 3d-posn has an x field, but there is no 3d-posn-x selector:")
(3d-posn-x p)
(code:comment "use the supertype's posn-x selector to access the x field:")
(posn-x p)
]
@; ------------------------------------------------------------