Hi, I created a simple class to test the printable<%> interface:
(define my-class%
(class* object% (printable<%>)
(super-new)
(define/public (custom-display out)
(displayln "custom-display"))
(define/public (custom-write out)
(writeln "custom-write"))
(define/public (custom-print out depth)
(print "custom-print\n" out))))
But when I try to display an object of this class, the custom-display
function is called twice, why?
>(define obj (new my-class%))
>(display obj)
custom-display
custom-display
And When I write the object, custom-display is also called first:
> (write obj)
custom-display
"custom-write"
With print:
> (print obj)
custom-display
custom-display
"custom-print\n"
I think I must have missed something here, and I can't find anything about
this in the documentation of printable<%>, please help.
Thanks.
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