Module (chicken continuation) (historical revision 35525)

You are looking at historical revision 35525 of this page. It may differ significantly from its current revision.

manual

Module (chicken continuation)
1. Continuations API

Module (chicken continuation)

This module provides a more powerful interface for continuations than that provided by call/cc.

More information about this continuation API can be found in the paper http://repository.readscheme.org/ftp/papers/sw2001/feeley.pdf A Better API for first class Continuations by Marc Feeley.

Continuations API

continuation-capture

[procedure] (continuation-capture PROCEDURE)

Creates a continuation object representing the current continuation and tail-calls PROCEDURE with this continuation as the single argument.

Returns #t if X is a continuation object, or #f otherwise. Please note that this applies only to continuations created by the Continuation API, but not by call/cc, i.e.: (call-with-current-continuation continuation?) returns #f, whereas (continuation-capture continuation?) returns #t.

continuation-graft

[procedure] (continuation-graft CONT THUNK)

Calls the procedure THUNK with no arguments and the implicit continuation CONT.

continuation-return

[procedure] (continuation-return CONT VALUE ...)

Returns the value(s) to the continuation CONT. continuation-return could be implemented like this:

(define (continuation-return k . vals)
  (continuation-graft
    k
    (lambda () (apply values vals))))

Previous: Module (chicken condition)

Next: Module (chicken csi)