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
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--
Gil Barmwater
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