# From http://liufengyun.chaos-lab.com/prog/2013/10/23/continuation-in-ruby.html

require "continuation"

# Here, cc calls back into f from g, and causes g to be
#   called again and again (until the array is empty).
#
# This looks a bit like cooperative threading, with functions
#   giving each other control and/or tasks. Ruby's "yield"
#   can be implemented this way.

def f
  arr = [ "Freddie", "Herbie", "Ron", "Max", "Ringo" ]
  cc = callcc {|cc| cc}
  g(cc, arr.shift) if arr.size > 0
end

def g(cont, message)
  puts message
  cont.call(cont)
end

f