What you are missing is the act of coercing the source collection into a
compatible type (this is described in section 5.3.19 The Concept of Set
Operations). In this situation, the items are used to integration with the
set. If you wish to merge the indexes, then source~allindexes as an
argument for the merge.
Rick
On Tue, Aug 20, 2013 at 5:19 PM, Ruurd Idenburg <ru...@idenburg.net> wrote:
> This is the description of set~intersection:
>
> 5.3.14.4. intersection
> >>-intersection(argument)--------------------------------------><
> Returns a new collection (of the same class as the receiver) containing
> only those items from the receiver
> whose indexes are in both the receiver collection and the argument
> collection. The argument can be any
> collection class object. The argument must also allow all of the index
> values in the receiver collection.
>
> and I think this is the code for set~intersection in CoreClasses.orx:
>
> ::METHOD intersection -- take the intersection of sets
> use strict arg other -- get the companion object
> signal on nomethod
> new = self~class~new -- use a new instance
> if other~isA(.Collection) then
> values = other~allitems -- get all of the items from the
> other collection
> else
> values = other~makearray -- ask for an array version of the
> source
> count = values~items
> do i = 1 to count
> index = values[i]
> -- if we have one of these, put into the result
> -- NB: Since this is a SET, there will only be one copy accumulated.
> if self~hasindex(index) then
> new~put(index)
> end
> return new -- return the difference collection
> nomethod: -- unknown method sent
> raise syntax 93.948 array(1, "Collection")
>
> In my case the other collection is a .directory, where items and indexes
> are not necessarily the same.
>
> What am I misunderstanding?
>
> -- Ruurd Idenburg
>
>
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