instance methods are sent to objects:
([EMAIL PROTECTED]) x
x is an instance method sent to a point
@ is an instance method sent to 10
Now have a look at the class side (press the button class) on the
class Form
apparently there is a method extent: aPoint
This method is a method that will be executed when a class receives
the message extent:
Not that conceptually
Form new extent: aPoint
apparently there is no instance method name extent:
but if you try (Form new setExtent: [EMAIL PROTECTED] depth: 1) you will get
a form
but set* may indicate that this is a method that you should not
direcly invoke (as explained in the book of Beck or Smalltalk by
Example)
Stef
On 5 janv. 07, at 05:56, Bruce Prior wrote:
Hi Squeakers,
I have been reading Adele Goldberg's classic text, "Smalltalk-80
The Interactive Programming Environment," and came across this in
Chapter 7, "How to make Pictures."
Adele states, "Create a Form Editor by evaluating an expression of
the form,
(Form new extent: 300 @ 400) edit"
It didn't work for me in Squeak 3.8 (on my Macintosh).
Further down, Adele says, "The message edit can be sent to any
instance of Form." But when I checked with my browser I found that
Form has a class method extent: but not an instance method extent:.
So I tried (Form extent: 300 @ 400) edit and the Form Editor
appeared as desired. Is this because Smalltalk and Squeak are
different somehow, or is there a mistake in the text, or?
Squeak has 26 years more :)
If the text is correct, then I still don't fully appreciate the
difference between class and instance methods.
Bruce Prior (still looking for "ah - ha!" and I think it's close....)
_______________________________________________
Beginners mailing list
Beginners@lists.squeakfoundation.org
http://lists.squeakfoundation.org/mailman/listinfo/beginners
_______________________________________________
Beginners mailing list
Beginners@lists.squeakfoundation.org
http://lists.squeakfoundation.org/mailman/listinfo/beginners
