Stem assignment is documented in section 1.13.4 of the Reference.
Rick
On Mon, Oct 14, 2024 at 1:11 PM Gilbert Barmwater <gi...@bellsouth.net>
wrote:
> Thanks Rick! I modified the program to add:
>
> gColl = .stemX~new
> gColl[foo] = 'One'
> gColl[bar] = 'Two'
> say gColl~items 'items'
> gColl~count -- says '2' !
>
> Rather than assigning the instance of the subclass to a stem variable, it
> assigns it to a "normal" variable. Then it uses the '[]=' method to add
> the two item to the collection. Now both the say statement and the count
> message produce the same (expected) result.
>
> I have checked both the Programming Guide and the Reference and did not
> find this documented. If you know differently, please let me know.
> Otherwise I will open a documentation "bug".
>
> Gil B.
> On 10/14/2024 12:10 PM, Rick McGuire wrote:
>
> The classic trap. Assignment if a stem to a stem variable only works if
> the right hand side is exactly an instance of the .Stem class, not a
> subclass. Your stem subclass got assigned as the default value of the stem
> variable, not as the base stem object.
>
> Rick
>
> On Mon, Oct 14, 2024 at 12:06 PM Gilbert Barmwater <gi...@bellsouth.net>
> wrote:
>
>> I need some help in understanding the behavior of the following code.
>> It creates two subclasses, one of List and one of Stem, that inherit
>> from a mixin class which adds a single method named Count. I would
>> expect that method to behave the same for instances of either subclass
>> but it does not. Here is the code:
>>
>> -- test the added Count method
>>
>> aColl = .listX~new
>> aColl~append('One')
>> aColl~append('Two')
>> say aColl~items 'items'
>> aColl~count -- says '2'
>>
>> sColl. = .stemX~new
>> sColl.foo = 'One'
>> sColl.bar = 'Two'
>> say sColl.~items 'items'
>> sColl.~count -- says '0' !
>>
>> -- a class to add a Count method to another class
>> ::class addCount mixinclass Object public
>>
>> ::method count
>> say self~items
>>
>> ::class listX subclass list inherit addCount
>>
>> ::class stemX subclass stem inherit addCount
>>
>> The output is:
>>
>> 2 items
>> 2
>> 2 items
>> 0
>>
>> --
>> Gil Barmwater
>>
>>
>>
>> _______________________________________________
>> Oorexx-devel mailing list
>> Oorexx-devel@lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/oorexx-devel
>>
>
>
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>
> --
> Gil Barmwater
>
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