On 2012-07-01 09:27:00 -0400, Eli Barzilay wrote:
> A more robust way to do that, which has become idiomatic in Racket is
> to use (gensym). (And as a sidenote, in other implementations there
> are various similar eq-based hacks.) IMO, this is an attempt to
> improve on the #f case by guaranteeing a unique value, but at its core
> it's still a similar hack.
The gensym thing is used in parts of the GUI code for initialization
arguments, e.g.:
(class* mred% (area<%>)
(init mk-wx get-wx-pan get-outer-wx-pan mismatches prnt
[min-width no-val]
[min-height no-val]
[stretchable-width no-val]
[stretchable-height no-val])
...)
Where `no-val` has been defined with a gensym. So it'd be nice to have
the distinguished `no-argument` for these cases too.
Cheers,
Asumu
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