On 9 Feb 2014, at 17:57, Pascal J. Bourguignon <p...@informatimago.com> wrote:
> If you want to allow any kind of keywords for any call to the generic > function, you can declare it as: > > (defgeneric foo (a b &key &allow-other-keys)) > (defmethod foo (a b &key c d &allow-other-keys) (or c d 42)) > > or alternatively, if you're concerned only with a single call, you can > call it as: > > (foo unknown-object-1 unknown-object-2 :d 3 :allow-other-keys t) I recommend to be careful with :allow-other-keys t. I recently used it a bit too indiscriminately, and this created some problems. The reason was that I created a few levels of indirection that looked roughly like this: (defun foo (a b c &rest args &key k1 k2) … (apply ‘bar … args) …) If you call (foo 1 2 3 :k3 :allow-other-keys t), this can be handy, but keep in mind that the additional keyword parameter is passed down also in &rest args, and this may screw up further processing down the lines. It was possible to resolve this with a more careful definition of the parameter lists, and the code is now much cleaner. Pascal -- Pascal Costanza The views expressed in this email are my own, and not those of my employer.
