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Re: Macro vs Function


From: David Kastrup
Subject: Re: Macro vs Function
Date: Wed, 12 Apr 2006 15:52:16 +0200
User-agent: Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux)

"Herbert Euler" <address@hidden> writes:

>>From: David Kastrup <address@hidden>
>>To: "Herbert Euler" <address@hidden>
>>CC: address@hidden
>>Subject: Re: Macro vs Function
>>Date: Wed, 12 Apr 2006 14:19:24 +0200
>>
>>By not mixing up what you do when?
>>
>>(defmacro xgp-casi2-safe-call-iter (func largs)
>>  (if largs
>>      `(condition-case nil
>>         (apply ,func ,(car largs))
>>       (error (xgp-casi2-safe-call-iter ,func ,(cdr largs))))
>>    'nil))
>
> Hmm...  The correct one should be:
>
> (defmacro xgp-casi2-safe-call-iter (func largs)
>  (if largs
>      `(condition-case nil
>           (apply ,func ,((lambda (a) `(quote ,(car a))) largs))
>         (error (xgp-casi2-safe-call-iter ,func ,(cdr largs))))
>    'nil))
>
> Only ,(car largs) is not sufficient.

Oh good grief.  What _are_ you trying to accomplish?  What you wrote
above is a complete and utter contorted mess.

So please come up with an actual _example_ of what you intend the
stuff to do.  I'd be surprised if my proposal would not be closer to
doing the intended thing than what you wrote.

-- 
David Kastrup, Kriemhildstr. 15, 44793 Bochum




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