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Re: [Gcl-devel] methods

From: Raymond Toy
Subject: Re: [Gcl-devel] methods
Date: Fri, 17 Jan 2014 09:51:51 -0800
User-agent: Gnus/5.101 (Gnus v5.10.10) XEmacs/21.5-b34 (darwin)

>>>>> "Leo" == Leo Butler <address@hidden> writes:

    Leo> Hi, I don't understand the following behaviour.

    >> (defstruct w (a))

    Leo> W

    >> (defmethod print-object ((w w) s) (format s "#s(w :a ~a) ;; w
    >> struct" (w-a w)))

    Leo> #<Standard-Method PRINT-OBJECT (W T) 74054530>

    >> #s(w a 1)

    Leo> #S(W A 1)

    >> (print-object * t)
    Leo> #s(w :a 1) ;; w struct
    Leo> NIL

    Leo> My expectation is that the last 2 outputs should be the
    Leo> same. Why aren't they? Note that

Perhaps gcl's defstruct doesn't support print-object?  I know cmucl
had this problem long ago.  The most portable way is to specify a
:print-function.  I guess as a bonus, this allows you to print an
abbreviated form if the current print depth is too deep.  I don't
think you get with :print-object.


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