greg <[EMAIL PROTECTED]> writes:
> André Thieme wrote:
>> (aif (timeConsumingCalculation)
>> (use it))
>
> I think the answer is that you just wouldn't do
> that in Python at all. Having magic variables
> spring into existence in your local namespace
> as a side effect of calling something is just
> not Pythonic. (It is very Perlish, on the other
> hand.)
Anaphoric macros are controversial in CL, too, for just that reason.
But there are a parallel set of macros that explicitly bind a variable
so you can get the convenience without the weirdness:
(bif (items (remove-if-not #'useful-p big-list-o-items))
(format t "~D items~%" (length items))
(format t "Nothing useful.~%"))
You can rewrite the expression in the grandparent as:
(aif (result (timeConsumingCalculation))
(use result)
or, more idiomatically:
(awhen (result (time-counsuming-calculation))
(use result))
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