continuation passing style
continuation
continuations

    (CPS) A style of programming in which every user
   function f takes an extra argument c known as a continuation.
   Whenever f would normally return a result r to its caller, it
   instead returns the result of applying the continuation to r.
   The continuation thus represents the whole of the rest of the
   computation.  Some examples:

    normal (direct style)    -->	continuation passing

    square x = x * x		square x k = k (x*x)

    g (square 23)			square 23 g

    (square 3) + 1			square 3 ( \ s . s+1 )

   (1995-04-04)