>
>
>> - The requires algorithm is not directly related to Traits (as I
>> pointed out in a recent mail)
>
> That's cool, but why is it there?
I can reply to you on that one :)
Some historical background first. Nathanael (who was hesitating to go to work
with andreas - since andreas
was really interested to have traits to build user interface for kids - I
remember them drawing picture on
the board of nathanael and marcus office) implemented a Browser that showed
instantaneously where you would need to provide a method because of a trait
composition.
This was difficult because of the quality of Squeak library (containing a lot
of self send to method
not existing in Object), the bad state of the browser and because the system is
dynamic (you can add a method anytime anywhere). This is explained in depth in
his PhD.
Nathanael was wise and declined the offer to go to google. I'm sure that he
does not feel insulted
by certain statement because a lot of languages would like to have traits or
introduce them instead
of bashing them: Scala, Perl, Fortress... we even got a guy of MS that asked us
to apply to get a grant
to port trait to C# (boring with types).
Nathanael did a first implementation of traits that was driven by tape to fix a
lot of places which
were suboptimal. Then Adrian reimplemented the core as part of his master
thesis. The idea
was that Squeak deserved a good trait implementation if we wanted to get a
chance to build on them.
The state of the Squeak browser was getting in our way (no tree widgets at that
time still not today). OB was not an alternative - no tree widgets. So adrian
did not get the time and will to fix the Squeak UI lib and build a browser.
Now this is just fun to see how some people have the tendency to insult others
because I think that adrian is
- a really smart guy (got several awards for his work)
- talented (run his own company since years in parallel to do research)
I mean a real company that is not sponsored but live with the money it
collects.
Then practically during the last two years, we clean a ***lot*** of problem.
Now squeak is starting to clean.
Mainly also because nicolas is pushing a lot of fixes from pharo to squeak.
And we go at our little speed but we go steadily and we will continue.
I imagine that this gives an historical view to the question and I thanks you
because we will probably clean it.
Stef
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