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Re: Re: Assignment no, dynamic scoping si (was: Wishes

Subject: Re: Re: Assignment no, dynamic scoping si (was: Wishes for XSL revisions ...
From: Dimitre Novatchev <dnovatchev@xxxxxxxxx>
Date: Mon, 31 Dec 2001 22:20:14 -0800 (PST)
assignment sale nj
terje at in-progress dot com (Terje Norderhaug) wrote:

> >
> >It is obvious that any function with implicit parameters cannot be used as a
> >class object (e.g. passed as parameter to other functions, or returned as their
> >result). Such functions will be difficult to combine with other functions and
> >generally to reuse. 
> I suspect you are mistaken. Using function with implicit parameters as a first 
> class objects  works fine in Common LISP, where implicit parameters will be 
> captured in a closure that has the same extent as the function object.

No, I'm not mistaken. Read the article at:


In section 6. at the end of the left column on page 10 the authors say:

"Implicit parameters provide the same functionality as dynamic scoping in Lisp,
except that implicitly parameterized functions are not first-class, and thus can't
be passed as arguments to functions... Thus, we would argue that implicit parameters
give you the best of dynamic scoping, while avoiding its worst pitfalls."

Dimitre Novatchev.

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