Re: Executing function only if another function is defined

[Emanuel Berg]

carlmarcos--- via Users list for the GNU Emacs text editor wrote:

> Because it may be possible that some functions are not
> available (e.g. during testing or debugging phases), I would
> like to test whether the function `toucan' has been defined
> before I call `docboost'. What can I do?
>
> (defun toucan-usage ()
>   "TODO"
>
>   (docboost 'toucan "Usage Information"))

(Why are you using no-break space?)

What you can do?

You can ...

1. `require' the library where "toucan" is defined.

2. Use the hash/sharp-quote, #', instead of just the quote for
   toucan. (#' is `function' and ' is `quote' BTW.)

3. Byte-compile. The byte compiler will tell you if toucan
   is undefined.

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