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mvalue.scm
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1999-01-02
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#| -*-Scheme-*-
$Id: mvalue.scm,v 3.1 1999/01/02 06:06:43 cph Exp $
Copyright (c) 1987, 1999 Massachusetts Institute of Technology
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|#
;;;; Multiple Value Support
(declare (usual-integrations))
(define (transmit-values transmitter receiver)
(transmitter receiver))
(define (multiple-value-list transmitter)
(transmitter list))
(define (return . values)
(lambda (receiver)
(apply receiver values)))
;;; For efficiency:
(define (return-2 v0 v1)
(lambda (receiver)
(receiver v0 v1)))
(define (return-3 v0 v1 v2)
(lambda (receiver)
(receiver v0 v1 v2)))
(define (return-4 v0 v1 v2 v3)
(lambda (receiver)
(receiver v0 v1 v2 v3)))
(define (return-5 v0 v1 v2 v3 v4)
(lambda (receiver)
(receiver v0 v1 v2 v3 v4)))
(define (return-6 v0 v1 v2 v3 v4 v5)
(lambda (receiver)
(receiver v0 v1 v2 v3 v4 v5)))
(define (list-multiple first . rest)
(apply call-multiple list first rest))
(define (cons-multiple cars cdrs)
(call-multiple cons cars cdrs))
(define (call-multiple procedure . transmitters)
(apply return
(apply map
procedure
(map multiple-value-list transmitters))))