From: ts <decoux@...>
Date: 2004-04-17T21:10:33+09:00
Subject: Re: New Local Variable Scope rule

>>>>> "D" == David Alan Black <dblack@wobblini.net> writes:

D> Going back to the original point (more or less): I'm just a little
D> perplexed by the whole idea of closures (blocks, Procs, lambdas)
D> having this compile-time effect on local variables in their context of
D> creation.  

 Well, actually this is at compile time that ruby make the difference
 between local, block-local variable and method call.

 If I've well understood, in 2.0 this is not changed : the only difference
 is how ruby make the difference between local and block-local variable.

 Now the worst case is perhaps this

svg% cat b.rb
#!/usr/bin/ruby
thr = []
5.times do |i|
   thr << Thread.new do
      a = i
      Thread.stop
      puts a
   end
end

thr.each {|t| t.run }
svg%
 
svg% b.rb
0
1
2
3
4
svg% 

 I'm not sure but I think that for 2.0 all threads will give the same
 result.

 Do these constructs are really frequent ? I don't know.

 The best way do know this is to modify your personnal version of ruby and
 use it : you can have surprise :-)))


Guy Decoux