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Re: collection classes
- To: Jonathan Bachrach <Jonathan.Bachrach@ircam.fr>
- Subject: Re: collection classes
- From: moon (David A. Moon)
- Date: Fri, 18 Dec 92 18:09:25 EST
- Cc: email@example.com
> Date: Fri, 4 Dec 1992 18:12:25 +0100
> From: Jonathan Bachrach <Jonathan.Bachrach@ircam.fr>
> I've implemented the collection classes and have the following wish list:
> 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))
> (define-generic-function concatenate! (mutable-sequence #rest rest-sequences))
I believe all of these are subsumed by an improved version of replace-subsequence! that
we are thinking about and will probably adopt. I like the idea of one function doing the
work of five.
> 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.
> There seems no reason to me why a setter was not provided for `last':
> (define-generic-function (setter last) (new-value mutable-sequence))
Good point, I think we should add this. By the way in Dylan the new-value
argument goes at the end.
> I would like to see <table> take `test:' as an init-keyword:
> (make <table> #key (test =))
In general this is a good idea but there are a lot of very complex issues
associated with it and we would need to see a specific proposal.