Re: New function `emacs-version>='

["Ehud Karni" <ehud@unix.mvs.co.il>]

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On Fri, 02 May 2003 23:35:14 +0200, Juanma Barranquero <lektu@terra.es> wrote:
> 
> On Fri, 02 May 2003 17:14:07 -0400, "Stefan Monnier" <monnier+gnu/emacs@rum.cs.yale.edu> wrote:
> 
> > It's just that sometimes it's difficult
> > to test whether A works or not.  For instance, how do you check whether
> > the `display' property is supported by your version of Emacs ?
> 
> Yeah, sure. But most features are not isolated, there are related
> variables, functions and sometimes even an entry in `features'... And if
> not, I'd call that a bug in the feature/fix implementation (I'm
> exaggerating, but only a bit.)
> 
> And, as a last resort, you can often do something like
> 
>   (unless (ignore-errors XXXX)
>     YYYY)

That is NOT always possible, I have another actual example:
How do you check that `perform-replace' accept a function in its
REPLACEMENTS argument (id does in 21.x, does not in 20.x or lower) ?

I have a hacked `perform-replace-20' (which is not the same as the 
current version) function for older emacs's and I do:
    (if (< emacs-major-version 21)
        (defalias 'perform-replace 'perform-replace-20))

please suggest a better way.

Ehud.


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