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link-single.cpp

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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 #include <gecode/int/channel.hh>
00035 
00036 namespace Gecode { namespace Int { namespace Channel {
00037 
00038   forceinline
00039   LinkSingle::LinkSingle(Space& home, LinkSingle& p)
00040     : MixBinaryPropagator<BoolView,PC_BOOL_VAL,IntView,PC_INT_VAL>
00041   (home,p) {}
00042 
00043   Actor*
00044   LinkSingle::copy(Space& home) {
00045     return new (home) LinkSingle(home,*this);
00046   }
00047 
00048   PropCost
00049   LinkSingle::cost(const Space&, const ModEventDelta&) const {
00050     return PropCost::unary(PropCost::LO);
00051   }
00052 
00053   ExecStatus
00054   LinkSingle::propagate(Space& home, const ModEventDelta&) {
00055     if (x0.zero()) {
00056       GECODE_ME_CHECK(x1.eq(home,0));
00057     } else if (x0.one()) {
00058       GECODE_ME_CHECK(x1.eq(home,1));
00059     } else {
00060       assert(x0.none() && x1.assigned());
00061       if (x1.val() == 0) {
00062         GECODE_ME_CHECK(x0.zero_none(home));
00063       } else {
00064         assert(x1.val() == 1);
00065         GECODE_ME_CHECK(x0.one_none(home));
00066       }
00067     }
00068     return home.ES_SUBSUMED(*this);
00069   }
00070 
00071 }}}
00072 
00073 // STATISTICS: int-prop