Indeed it is but I think it could be clearer on the subject of
sub-classes of .stem. Also a link to that section from the section on
the Stem Class might be appropriate as I didn't realize that section
1.13.4 even existed. BTW, doing
s. = .stem~enhanced(meths) -- meths is a collection containing method
objects/source and their names
also doesn't allow s. to have additional methods added to it. FWIW
Gil
On 10/14/2024 1:41 PM, Rick McGuire wrote:
Stem assignment is documented in section 1.13.4 of the Reference.
Rick
On Mon, Oct 14, 2024 at 1:11 PM Gilbert Barmwater
<[email protected]> 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
<[email protected]> 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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