Re: UndefinedObject

Am 12.06.2006 um 23:51 schrieb mathieu:

> Bert Freudenberg a écrit :
> > Am 12.06.2006 um 23:08 schrieb nicolas cellier:
> >
> > > Le Dimanche 11 Juin 2006 14:54, mathieu a écrit :
> > > > An other things intresting is where do nil being initialized? [I  
> > > > know he
> > > > is an old friend but it should have been born in a certain  
> > > > time  :-) ]
> > >
> > > I think this one is so essential, that you can only find it in some
> > > bootstrap
> > > method not written in Smalltalk.
> > >
> > > There must be a few initializer that you will hardly find in the
> > > image, like
> > > initialization of Smalltalk (I mean SystemDictionary).
> > > Did you see something like Smalltalk at: #Smalltalk put: Smalltalk ?
> > >
> > > Like the (Metaclass class class) knot...
> > >
> > > Like the Process stuff...
> > >
> > > Feel free to discover more!
> > >
> > > You must admit that an image must have been created once ex  
> > > nihilo (or
> > > rather
> > > ex C-code glue).
> >
> > Most certainly not C. The first Smalltalk prototype was a BASIC  
> > program,
> > Smalltalk-72 was coded in assembly. We'd have to ask Dan to be sure
> > where the nil instance in Squeak comes from ...
> >
> > - Bert -
>
> Yes like an historian job. :-)

The ultimate historic reference is Alan Kay's "The Early History of  
Smalltalk" in "History of Programming Languages HOPL-II", which you  
can find in a scientific library near you. Or print this scanned  
version (it's hard to read on screen):

http://www.smalltalk.org/downloads/papers/SmalltalkHistoryHOPL.pdf

(there are HTML versions of this on the net, but they all have  
transcription errors AFAIK)

Also, Dwight Hughes has collected several papers about Smalltalk  
history:

        http://www.ipa.net/~dwighth/

And, to understand the life at PARC, where Smalltalk was born, I very  
much like "Dealers of Lightning" by Hiltzik. An enlightening read :)

> Very instresting. :-)
>
> But who where the first object Metacalss or Behavior? :-)

I'd guess Object was the first behavior. Metaclasses where only  
introduced much much later, in Smalltalk-80, and many agree they are  
an unnecessary complication.

- Bert -