--- Begin Message ---
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Subject: |
24.3; Documentation bug: Example code in (elisp) Anonymous Functions |
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Date: |
Fri, 6 Dec 2013 19:18:53 +1300 (NZDT) |
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User-agent: |
SquirrelMail/1.4.5 |
Re: Info node (elisp) Anonymous Functions
The final piece of code is prefixed with "This would not happen if, say,
you had constructed the anonymous function by quoting it as a list",
but the code then fails to actually do that. It is actually identical
to the initial version of the function:
> In the following example, we define a `change-property' function
> that takes a function as its third argument, followed by a
> `double-property' function that makes use of `change-property' by
> passing it an anonymous function:
>
> (defun change-property (symbol prop function)
> (let ((value (get symbol prop)))
> (put symbol prop (funcall function value))))
>
> (defun double-property (symbol prop)
> (change-property symbol prop (lambda (x) (* 2 x))))
>
> Note that we do not quote the `lambda' form.
>
> If you compile the above code, the anonymous function is also
> compiled. This would not happen if, say, you had constructed the
> anonymous function by quoting it as a list:
>
> (defun double-property (symbol prop)
> (change-property symbol prop (lambda (x) (* 2 x))))
>
> In that case, the anonymous function is kept as a lambda expression in
> the compiled code. The byte-compiler cannot assume this list is a
> function, even though it looks like one, since it does not know that
> `change-property' intends to use it as a function.
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--- Begin Message ---
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Subject: |
Re: bug#16067: 24.3; Documentation bug: Example code in (elisp) Anonymous Functions |
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Date: |
Fri, 06 Dec 2013 09:17:26 -0500 |
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User-agent: |
Gnus (www.gnus.org), GNU Emacs (www.gnu.org/software/emacs/) |
Version: 24.4
Thanks. This was fixed some months ago in the sources.
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