Lexical closures in Squeak
Jason Dufair
jase at dufair.org
Mon Aug 12 15:32:25 UTC 2002
With my recent venture into spawning Squeak processes, I have a
question. From having lurked on the list for many months, I am under
the impression that Squeak's blocks are not true lexical closures (and
that someone(s) are working toward this). If this is true, then why
does something like (forgive any errors - I'm going from memory)
StateMachine>>forkNextTrackProcess
[ | delay |
delay _ Delay forMilliseconds: 300.
[terminating]
whileFalse:
[streamingMp3File samplesRemaining = 0
ifTrue: [self nextTrack].
Process waitFor: delay]] fork.
work? 'terminating' is an instance variable of StateMachine, by the
way. It would seem that this wouldn't be possible without true lexical
closure. I'm no CS major, so please speak slowly and avoid polysyllabic
words :-)
--
Jason Dufair - jase at dufair.org
http://www.dufair.org/
"In matters of style, swim with the current;
in matters of principle, stand like a rock."
-- Thomas Jefferson
More information about the Squeak-dev
mailing list
|