From: ts <decoux@...>
Date: 2001-09-30T16:26:06+09:00
Subject: [ruby-talk:21837] Re: Segfault with callcc

>>>>> "P" == Paul Brannan <pbrannan@atdesk.com> writes:

P> class Foo
P>   def initialize(arr)
P>     cc1 = nil
P>     arr.each do |f|
P>       cc1 = callcc do |cc2|
P>         callcc do |cc1|
P>           cc2.call(cc1)
P>         end
P>         return
P>       end
P>     end
P>     # If I put a puts "foo" here, then this code doesn't crash.
P>     cc1.call(nil) unless not cc1
P>   end
P> end

 It's funny to use :-)


pigeon% cat b.rb
#!/usr/bin/ruby
def tt
   cc1 = nil
   [1].each do |f|
      cc1 = callcc do |cc2|
         callcc do |cc1|
            cc2.call(cc1)
         end
         return
      end
   end
   puts cc1
   cc1.call(nil) unless not cc1
end

tt
a = "a new name for Continuation"
tt
pigeon% 
pigeon% b.rb
#<Continuation:0x401b4a04>
#<a new name for Continuation:0x401b457c>
pigeon% 

 Only one problem, it's difficult to predict which variable is recycled :-)


Guy Decoux