#| -*-Scheme-*-

$Id: boolean-examples.scm 2865 2006-04-14 03:28:56Z cph $

Copyright 2006 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
USA.

|#

;;;; Boolean constraints: examples

(declare (usual-integrations))

(let ((cn (cp:make-network 'test (cp:make-value-model boolean? boolean=?))))
  (let ((j1 (cp:make-connector 'j1 cn))
	(j2 (cp:make-connector 'j2 cn))
	(p1 (cp:make-connector 'p1 cn))
	(p2 (cp:make-connector 'p2 cn))
	(t (cp:make-connector 't cn)))
    (cp:assume-value t #t)
    (cp:make-constraint cp:boolean-not #f cn j1 p1)
    (cp:make-constraint cp:boolean-not #f cn j2 p2)
    (cp:make-constraint cp:boolean-or #f cn t j1 j2)
    (cp:make-constraint cp:boolean-or #f cn t p1 p2)
    (cp:assume-value j2 #t)
    (fresh-line)
    (write-char #\;)
    (write-line (cp:value-of j1))
    (write-char #\;)
    (write-line (cp:value-of j2))
    (write-char #\;)
    (write-line (cp:value-of p1))
    (write-char #\;)
    (write-line (cp:value-of p2))
    ))
;#f
;#t
;#t
;#f
;Unspecified return value

(let ((cn (cp:make-network 'test (cp:make-value-model boolean? boolean=?))))
  (let ((j1 (cp:make-connector 'j1 cn))
	(j2 (cp:make-connector 'j2 cn))
	(p1 (cp:make-connector 'p1 cn))
	(p2 (cp:make-connector 'p2 cn))
	(t (cp:make-connector 't cn)))
    (cp:assume-value t #t)
    (cp:make-constraint cp:boolean-not #f cn j1 p1)
    (cp:make-constraint cp:boolean-not #f cn j2 p2)
    (cp:make-constraint cp:boolean-or #f cn t j1 j2)
    (cp:make-constraint cp:boolean-or #f cn t p1 p2)
    (cp:assume-value j1 #t)
    (fresh-line)
    (write-char #\;)
    (write-line (cp:value-of j1))
    (write-char #\;)
    (write-line (cp:value-of j2))
    (write-char #\;)
    (write-line (cp:value-of p1))
    (write-char #\;)
    (write-line (cp:value-of p2))
    ))
;#t
;#f
;#f
;#t
;Unspecified return value