I'm looking into whether Racket's class/object system might be useful for
one of my projects, and I am stumped by an error when deserializing
objects. I've managed to produce the error a few different ways, but here
is a fairly minimal example:
> (define-serializable-class ok% object%
(inspect #f)
(init-field [my-field null])
(super-new))
> (define-serializable-class broken% object%
(inspect #f)
(super-new)
(init-field [my-field null]))
> (deserialize (serialize (new ok%)))
(object:ok% '())
> (deserialize (serialize (new broken%)))
my-field: assignment disallowed;
cannot assign field before initialization
I am guessing there is some subtlety of the way new instances are
initialized that I don't properly understand. Can anyone explain what is
going wrong? (and, ideally, how to avoid the problem in other situations?)
Many thanks,
Philip
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