@ -1581,7 +1581,7 @@ An @deftech{enumeration} is a mapping of values to sequential integers.
@defclass[x:enum% x:base% ()]{
Base class for list formats. Use @racket[x:enum] to conveniently instantiate new list formats.
Base class for list formats. Use @racket[x:enum] to conveniently instantiate new enumeration formats.
@defconstructor[
([type x:int?]
@ -1636,7 +1636,19 @@ Generate an instance of @racket[x:enum%] (or a subclass of @racket[x:enum%]) wit
@racket[pre-encode-proc] and @racket[post-decode-proc] control the pre-encoding and post-decoding procedures, respectively. Each takes as input the value to be processed and returns a new value.
@racket[base-class] controls the class used for instantiation of the new object.
@racket[base-class] controls the class used for instantiation of the new object.
@examples[#:eval my-eval
(define e (x:enum #:type uint8
#:values '("foo" "bar" "baz" #f)))
(encode e "baz" #f)
(decode e #"\2")
(code:comment @#,t{corresponding enum value is #false, so we pass through input value})
(decode e #"\3")
(code:comment @#,t{no corresponding enum value, so we pass through input value})
