Re: [Chicken-users] is case-lambda expensive?

[Matthew David Parker]

Alright I'll just use case-lambda for portability reasons.  I'm sure the
delay from using case-lambda is minimal compared to the time it takes to
actually write a pixel to the screen or draw a rectangle.

Matt

On Wed, 24 May 2006, Kon Lovett wrote:

> On May 24, 2006, at 10:33 AM, Matthew David Parker wrote:
>
> >
> >
> >
> >> Ex: (w/ csi)
> >>
> >> #;1> (define (msdl.pixel x y rgb alpha #!optional (img 0)) 'foo)
> >> #;2> (procedure-information msdl.pixel)
> >> (msdl.pixel x y rgb alpha #!optional (img 0))
> >> #;3> (msdl.pixel 3)
> >> Error: too few arguments - received 1 but expected 4: #<procedure
> >> (msdl.pixel x y rgb alpha #!optional (img 0))>
> >>
> >>          Call history:
> >>
> >>          <eval>          (msdl.pixel 3)  <--
> >>
> >
> > That is just want I want; for it to throw an error and then print
> > out the
> > info, but I have to define and compile my functions in csc first,
> > so I get
> > the weird errors will all the numbers after them.  Is there some
> > way to
> > clean up the debug output from functions that come from csc?
>
> I don't think so. I don't see an 'invalid-procedure-call-arity-
> handler.' And the name of the optional is lost w/ the compiler. Umm,
> hook 'error'? Sorry.
>
> > Is it better
> > to use the #!optional thing instead of case-lambda? (I have to use
> > one of
> > those for the img argument at least).
>
> Hum, "better." Funny, for a "small" programming notation Scheme seems
> to have an almost Perl-like mania for multiple ways to do the same
> thing.
>
> Personal style & portability.
>
> case-lambda can be repetitive & no support for named arguments but it
> is a srfi.
>
> I find the DSSSL lambdas easier to read, but NOT portable. (Marc
> Feeley has a draft srfi-89 to replace DSSSL w/ a more scheme-like
> notation.)
>
> I think 'let-optionals' & ':optional' are by Olin Shivers from Scsh,
> and rather common.
>
> >
> > Matt
> >
> >
> >> And (w/ csc)
> >>
> >> Error: too few arguments - received 1 but expected 4: #<procedure
> >> (msdl.pixel x3 y4 rgb5 alpha6 . g27)>
> >>
> >>          Call history:
> >>
> >>          t1.scm: 3    msdl.pixel                 <--
> >>
> >>>
> >>> Thanks,
> >>> Matt
> >>>
> >>> (btw, "msdl" is just a temporary name, as there is already an
> >>> "msdl" for
> >>> SDL)
> >>>
> >>>
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> >>
> >>
> >
> >
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