Support of algebraic operations on sets

J J azreal1977 at
Wed Jun 20 17:04:03 UTC 2007

> Date: Sun, 17 Jun 2007 22:56:42 +0300> From: siguctua at> To: Ron at; squeak-dev at> Subject: Re: Support of algebraic operations on sets> > 2nd: as Bert notes, Collections don't introduce index at all. There's> no #at: , #at:put: in Collection. Collections introducing basic> methods (like #do:) which used for iterating through all of its items,> which actually states that any collection must know how iterate> through own items, but there's nothing about how these items are> stored/accessed or how they are indexed.And this is place that traits can really help.  What would really be correct here is a trait called "Indexable" or similar that all indexable collections have.  Then we wouldn't have to have so many #shouldNotImplement messages. :)
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