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link-multi.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   LinkMulti::LinkMulti(Home home, ViewArray<BoolView>& x, IntView y, int o0)
00038     : MixNaryOnePropagator<BoolView,PC_BOOL_NONE,IntView,PC_INT_DOM>
00039   (home,x,y), c(home), status(S_NONE), o(o0) {
00040     x.subscribe(home,*new (home) Advisor(home,*this,c));
00041     // Propagator is scheduled because of the dependency subscription
00042   }
00043 
00044   forceinline
00045   LinkMulti::LinkMulti(Space& home, LinkMulti& p)
00046     : MixNaryOnePropagator<BoolView,PC_BOOL_NONE,IntView,PC_INT_DOM>
00047   (home,p), status(S_NONE), o(p.o) {
00048     assert(p.status == S_NONE);
00049     c.update(home,p.c);
00050   }
00051 
00052   forceinline ExecStatus
00053   LinkMulti::post(Home home, ViewArray<BoolView>& x, IntView y, int o) {
00054     int n=x.size();
00055     GECODE_ME_CHECK(y.gq(home,o));
00056     GECODE_ME_CHECK(y.lq(home,o+n-1));
00057     assert(n > 0);
00058     if (n == 1) {
00059       GECODE_ME_CHECK(x[0].one(home));
00060       assert(y.val() == o);
00061     } else if (y.assigned()) {
00062       int j=y.val()-o;
00063       GECODE_ME_CHECK(x[j].one(home));
00064       for (int i=0; i<j; i++)
00065         GECODE_ME_CHECK(x[i].zero(home));
00066       for (int i=j+1; i<n; i++)
00067         GECODE_ME_CHECK(x[i].zero(home));
00068     } else {
00069       for (int i=0; i<n; i++)
00070         if (x[i].one()) {
00071           for (int j=0; j<i; j++)
00072             GECODE_ME_CHECK(x[j].zero(home));
00073           for (int j=i+1; j<n; j++)
00074             GECODE_ME_CHECK(x[j].zero(home));
00075           GECODE_ME_CHECK(y.eq(home,o+i));
00076           return ES_OK;
00077         } else if (x[i].zero()) {
00078           GECODE_ME_CHECK(y.nq(home,o+i));
00079         }
00080       (void) new (home) LinkMulti(home,x,y,o);
00081     }
00082     return ES_OK;
00083   }
00084 
00085 }}}
00086 
00087 // STATISTICS: int-prop
00088