From: ts <decoux@...>
Date: 2005-04-13T02:00:38+09:00
Subject: Re: ability to run finalizers at a given point of a program?

>>>>> "G" == Guillaume Cottenceau <gcottenc@gmail.com> writes:

G> http://www.zarb.org/~gc/t/prog/destructor/nodestructor.rb

 The code is

G> class Foo
G>     def initialize
G>         puts "*** constructor"
G>     end
G> end
G> 
G> 
G> def scopeme
G>     foo = Foo.new
G>     ObjectSpace.define_finalizer(foo, proc { puts "*** pseudo-destructor" })
G> end
G> 
G> scopeme
G> puts "Foo was out-scoped."
G> 
G> GC.start
G> puts "Gc was run."

 you must know that the gc is a little special, try it with

svg% cat b.rb
#!/usr/local/bin/ruby
class Foo
   def initialize
      puts "*** constructor"
   end
   def self.final
      proc { puts "*** pseudo-destructor" }
   end
end

def scopeme
   foo = Foo.new
   ObjectSpace.define_finalizer(foo, Foo.final)
end

a = scopeme
puts "Foo was out-scoped."

GC.start
puts "Gc was run."

svg% 

svg% b.rb
*** constructor
Foo was out-scoped.
*** pseudo-destructor
Gc was run.
svg% 




Guy Decoux