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

require "continuation"

# Here, continuation allows f to call back into g after g returned;
#  With it, g acts like a "generator" for traversing the array.

# Note that the array is "private" to g; it only exists in g's stack
#   frame and the snapshots of the program state that continuations take
#   when created by callcc. Yet you can iterate through it!

def g
  arr = [ "Freddie", "Herbie", "Ron", "Max", "Ringo" ]
  cc = callcc {|cc| cc}
  puts arr.shift
  return cc, arr.size
end

def f
  c, size = g
  c.call(c) if size > 0
end

f