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Decls in Loop
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SRS  
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 More options Apr 30 2000, 3:00 am
Newsgroups: comp.lang.lisp
From: SRS <sr...@my-deja.com>
Date: 2000/04/30
Subject: Decls in Loop
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I'd like to put a declaration in the Loop Facility, something like this:

    (loop
        :for x :from 1 :to 10
        :do (declare (fixnum x))
            (print x))

but this doesn't seem to work. It is, however, possible to put decls in
other iteration constructs, like:

    (do ((x 1 (+ x 1)))
        ((> x 10))
        (declare (fixnum x))
        (print x))

Is it impossible to put declarations in Loop? If so, is there a reason
why, or have the folks at X3J13 overlooked it?

--SRS

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Rainer Joswig  
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 More options Apr 30 2000, 3:00 am
Newsgroups: comp.lang.lisp
From: Rainer Joswig <rainer.jos...@ision.net>
Date: 2000/04/30
Subject: Re: Decls in Loop
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In article <8ehcp8$b7...@nnrp1.deja.com>, SRS <sr...@my-deja.com>
wrote:

> I'd like to put a declaration in the Loop Facility, something like this:

>     (loop
>         :for x :from 1 :to 10
>         :do (declare (fixnum x))
>             (print x))

(loop for x fixnum from 1 to 10 do ...

 
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Erik Naggum  
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 More options Apr 30 2000, 3:00 am
Newsgroups: comp.lang.lisp
From: Erik Naggum <e...@naggum.no>
Date: 2000/04/30
Subject: Re: Decls in Loop
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* SRS <sr...@my-deja.com>
| Is it impossible to put declarations in Loop?

  no, but it has a different syntax than other declarations:

(loop :for x :of-type fixnum :from 1 :to 100 :do ...)

  note that "fixnum" is not a loop keyword, but the symbol naming the
  type.  see 6.1.1.7 [Loop] Destructuring in the standard.

#:Erik


 
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SRS  
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 More options May 2 2000, 3:00 am
Newsgroups: comp.lang.lisp
From: SRS <sr...@my-deja.com>
Date: 2000/05/02
Subject: Re: Decls in Loop
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In article <3166093389825...@naggum.no>,
  Erik Naggum <e...@naggum.no> wrote:

> * SRS <sr...@my-deja.com>
> | Is it impossible to put declarations in Loop?

>   no, but it has a different syntax than other declarations:

> (loop :for x :of-type fixnum :from 1 :to 100 :do ...)

Thanks! But what about other, non-type, declarations, such as
    (special ...) or (inline ...)
Do I have to use
    (locally (declare (special x))
        (loop ...))

--SRS

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Erik Naggum  
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 More options May 2 2000, 3:00 am
Newsgroups: comp.lang.lisp
From: Erik Naggum <e...@naggum.no>
Date: 2000/05/02
Subject: Re: Decls in Loop
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* SRS <sr...@my-deja.com>
| But what about other, non-type, declarations, ...

  Well, there's no special syntax for them, so you'd have to resort to
  declarations inherited from superior forms or within inferior forms.
  Please see the standard or other language reference on loop for the
  rich set of details on loop.

#:Erik


 
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