choose! and choose

[Jonathan Bachrach <Jonathan.Bachrach@ircam.fr>]

   Date: Fri, 18 Dec 92 18:09:25 EST
   From: moon@cambridge.apple.com (David A. Moon)

   > Date: Fri, 4 Dec 1992 18:12:25 +0100
   > From: Jonathan Bachrach <Jonathan.Bachrach@ircam.fr>
   > ...
   >   I would also like to see the following destructively functions added:
   >   (define-generic-function choose! (predicate mutable-sequence))
   >   (define-generic-function choose-by! (predicate test-sequence mutable-value-sequence))

   I don't understand what you propose these will do.

They would be more powerful `remove!' functions that take a general
predicate instead of an element to remove (as in `remove!').  They
would mutate the mutable-sequence such that only the ``chosen''
elements remain.  They return the mutated argument.

-- jonathan bachrach

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