collection classes

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

I've implemented the collection classes and have the following wish list:

NEW <SEQUENCE> GENERIC-FUNCTION'S

 The following function seems indispensible to me:

 (define-generic-function position (sequence element #key test count))

 I suggest adding the following function to the offered set functions:

 (define-generic-function difference (sequence1 sequence2 #key test)) 

 The following insertion function's are very useful for many sequences classes
 (like gap-list's).  It is difficult to write many of the sequence methods 
 because `add' does not specify where the new-element is inserted.

 (define-generic-function insert (sequence new-element insertion-position))
 (define-generic-function insert! (mutable-sequence new-element insertion-position))
 (define-generic-function insert-sequence 
     (sequence insertion-sequence insertion-position))
 (define-generic-function insert-sequence!
     (mutable-sequence insertion-sequence insertion-position))

DESTRUCTIVE <MUTABLE-SEQUENCE> FUNCTIONS

  It seems crucial to be able to destructively concatenate sequences:

  (define-generic-function concatenate! (mutable-sequence #rest rest-sequences))

  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))

NEW SETTER

  There seems no reason to me why a setter was not provided for `last':

  (define-generic-function (setter last) (new-value mutable-sequence)) 

NEW INIT-KEYWORD FOR <TABLE>

  I would like to see <table> take `test:' as an init-keyword:

  (make <table> #key (test =))

-- jonathan bachrach

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