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link-single.hpp

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00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main authors:
00004  *     Christian Schulte <schulte@gecode.org>
00005  *
00006  *  Copyright:
00007  *     Christian Schulte, 2007
00008  *
00009  *  Last modified:
00010  *     $Date: 2009-10-12 17:36:53 +0200 (Mon, 12 Oct 2009) $ by $Author: schulte $
00011  *     $Revision: 9878 $
00012  *
00013  *  This file is part of Gecode, the generic constraint
00014  *  development environment:
00015  *     http://www.gecode.org
00016  *
00017  *  Permission is hereby granted, free of charge, to any person obtaining
00018  *  a copy of this software and associated documentation files (the
00019  *  "Software"), to deal in the Software without restriction, including
00020  *  without limitation the rights to use, copy, modify, merge, publish,
00021  *  distribute, sublicense, and/or sell copies of the Software, and to
00022  *  permit persons to whom the Software is furnished to do so, subject to
00023  *  the following conditions:
00024  *
00025  *  The above copyright notice and this permission notice shall be
00026  *  included in all copies or substantial portions of the Software.
00027  *
00028  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00029  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00030  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00031  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00032  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00033  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00034  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00035  *
00036  */
00037 
00038 namespace Gecode { namespace Int { namespace Channel {
00039 
00040   forceinline
00041   LinkSingle::LinkSingle(Home home, BoolView x0, IntView x1)
00042     : MixBinaryPropagator<BoolView,PC_BOOL_VAL,IntView,PC_INT_VAL>
00043   (home,x0,x1) {}
00044 
00045   forceinline ExecStatus
00046   LinkSingle::post(Home home, BoolView x0, IntView x1) {
00047     if (x1.assigned()) {
00048       switch (x1.val()) {
00049       case 0:
00050         GECODE_ME_CHECK(x0.zero(home)); break;
00051       case 1:
00052         GECODE_ME_CHECK(x0.one(home)); break;
00053       default:
00054         return ES_FAILED;
00055       }
00056     } else if (x0.zero()) {
00057       GECODE_ME_CHECK(x1.eq(home,0));
00058     } else if (x0.one()) {
00059       GECODE_ME_CHECK(x1.eq(home,1));
00060     } else {
00061       GECODE_ME_CHECK(x1.gq(home,0));
00062       GECODE_ME_CHECK(x1.lq(home,1));
00063       (void) new (home) LinkSingle(home,x0,x1);
00064     }
00065     return ES_OK;
00066   }
00067 
00068 }}}
00069 
00070 // STATISTICS: int-prop
00071