What are you actually trying to achieve? I suspect a subclass might not be
required.
Rick
On Tue, Aug 20, 2013 at 7:15 PM, Ruurd Idenburg <ru...@idenburg.net> wrote:
> Ok, I see I'm referring to the receiver as a MapCollection, which a set
> ain't and for Set the items in the argument collection are used.
>
> Gotta subclass .set then to get what I want.
>
> Ruurd
>
>
> On 21-8-2013 1:00, Ruurd Idenburg wrote:
>
> Thanks Rick, but from .directory upwards the inheritance chain isn't it:
>
> .directory -> .MapCollection -> .Collection
>
> So what about this in section 5.3.19:
>
> If argument is a MapCollection, then index values are used to determine
> membership, and items are
> inserted into the result using the index and item pairs.
>
> Ruurd
>
> On 21-8-2013 0:46, Rick McGuire wrote:
>
> 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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>
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