From: David Kastrup <dak@gnu.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: emacs-devel@gnu.org
Subject: Re: Lexical environment for functions?
Date: Sun, 28 Dec 2014 07:40:59 +0100 [thread overview]
Message-ID: <87d2742s5g.fsf@fencepost.gnu.org> (raw)
In-Reply-To: <jwvppb4fxg4.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Sat, 27 Dec 2014 19:10:09 -0500")
Stefan Monnier <monnier@iro.umontreal.ca> writes:
>> Does that mean that lexical environments exist only for value cells?
>
> Yes, at least for the "native" lexical binding.
>
>> Because it would seem convenient, if one has some
>> Lisp-like presentation of a parse tree like XML, to just eval it with a
>> number of function bindings in place.
>
> Just like you could simulate the new (eval E ENV) form via
> (eval `(lexical-let ,ENV ,E)), you can do the above with
> (eval `(cl-flet FENV E)).
cl-flet is optimized for compilation rather that interpretation. So
this is not likely to make eval a good idea for fast interpretation of
parsed expressions.
--
David Kastrup
prev parent reply other threads:[~2014-12-28 6:40 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-27 17:11 Lexical environment for functions? David Kastrup
2014-12-28 0:10 ` Stefan Monnier
2014-12-28 6:40 ` David Kastrup [this message]
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