Sun Apr 8 01:15:54 CEST 2012

Duality: values <-> continuations

Values and continuations are supposedly dual (for an interesting
example see [1]).  From[2]:

  We can think of continuations as a lack of , or request for
  values. We can see this duality in another way: values are the
  present's view of past computations, while continuations are the
  present's view of future computations.

So if a function takes a value to a value, what takes a continuation
to a contination?

[1] entry://20120407-165335
[2] http://www.google.be/url?sa=t&rct=j&q=values%20and%20continuations%20are%20duals&source=web&cd=12&ved=0CC4QFjABOAo&url=http%3A%2F%2Fciteseerx.ist.psu.edu%2Fviewdoc%2Fdownload%3Fdoi%3D10.