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