Thanks for the reply.
> what do you return when you do not find the class
I guess you are talking about this block: "[ self objSuperclassId ifNotNil: [
self objSuperclass lookup: selector ]]". This code is based on the assumption
that the entire block returns "nil" when "self objSuperclassId" is "nil". I'm
going to check if my assumption was right.
- Edouard
On Thursday, November 19, 2015 8:17 PM, stepharo <[email protected]> wrote:
Hi edouard
I will check as soon as I get some time.
I'm new on this mailing list, this is my first mail :-)
welcome
I'm a student from University of Lille (France). I'm studying this tutorial
(I'm using Pharo 4 but it seems not to be a problem):
http://sdmeta.gforge.inria.fr/Teaching/ObjVLisp/ObjV.pillar.pdf. I'm working
with the "ObjVLispSkeleton-StephaneDucasse.1" image loaded from this
repository:
MCSmalltalkhubRepository owner: 'StephaneDucasse' project:
'ObjVLispSkeleton' user: '' password: ''
I'm stuck at "Method Lookup" p11. First, it seems that unit tests
"testNilWhenErrorInLookup" and "testRaisesErrorSendWhenErrorInLookup" are not
provided,
Mark if you read this mail. Did you get problem when you did it?
thus I'm not sure that I'm working with the right image (everything was fine
until p11 though). Then, the "lookup: selector" is not provided neither.
Not providing lookup: is ok since you have to define it. I will look for the
tests in my version.
While there is another method named "lookup: selector from: anObjObject", I
can't figure out what I'm supposed to do with the second parameter.
What you should see is that the second argument is is provided here because
when you raise an error, you should send a messageNotUnderstood
and this message should be sent to the original object that received the
message and not the class where the method was found.
So lookup will use the receiver to walk through the inheritance chain and the
from: argument in case of error
Here is what I would do:
lookup: selector "look for the method named <selector> starting in the
receiver. The lookup is done for a message sent to <anObjObject>. self is an
objClass" ^ self objMethodDict at: selector ifAbsent: [ self objSuperclassId
ifNotNil: [ self objSuperclass lookup: selector ] ]
what do you return when you do not find the class
Could someone tell me if this implementation is correct? If it's correct,
what do you think the second parameter is for?
Moreover, do you think I'm working with the right image?
Thanks.
- Edouard
