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range.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, 2004
00008  *
00009  *  Last modified:
00010  *     $Date: 2010-03-03 17:32:21 +0100 (Wed, 03 Mar 2010) $ by $Author: schulte $
00011  *     $Revision: 10364 $
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 #include <gecode/int/rel.hh>
00039 
00040 namespace Gecode { namespace Int { namespace Dom {
00041 
00042   template<class View>
00043   forceinline
00044   ReRange<View>::ReRange(Home home, View x, int min0, int max0, BoolView b)
00045     : ReUnaryPropagator<View,PC_INT_BND,BoolView>(home,x,b),
00046       min(min0), max(max0) {}
00047 
00048   template<class View>
00049   ExecStatus
00050   ReRange<View>::post(Home home, View x, int min, int max, BoolView b) {
00051     if (min > max) {
00052       return ES_FAILED;
00053     } else if (min == max) {
00054       return Rel::ReEqDomInt<View,BoolView>::post(home,x,min,b);
00055     } else if ((max < x.min()) || (min > x.max())) {
00056       GECODE_ME_CHECK(b.zero(home));
00057     } else if ((min <= x.min()) && (x.max() <= max)) {
00058       GECODE_ME_CHECK(b.one(home));
00059     } else {
00060       (void) new (home) ReRange<View>(home,x,min,max,b);
00061     }
00062     return ES_OK;
00063   }
00064 
00065 
00066   template<class View>
00067   forceinline
00068   ReRange<View>::ReRange(Space& home, bool share, ReRange& p)
00069     : ReUnaryPropagator<View,PC_INT_BND,BoolView>(home,share,p),
00070       min(p.min), max(p.max) {}
00071 
00072   template<class View>
00073   Actor*
00074   ReRange<View>::copy(Space& home, bool share) {
00075     return new (home) ReRange<View>(home,share,*this);
00076   }
00077 
00078   template<class View>
00079   ExecStatus
00080   ReRange<View>::propagate(Space& home, const ModEventDelta&) {
00081     if (b.one()) {
00082       GECODE_ME_CHECK(x0.gq(home,min));
00083       GECODE_ME_CHECK(x0.lq(home,max));
00084     } else if (b.zero()) {
00085       Iter::Ranges::Singleton r(min,max);
00086       GECODE_ME_CHECK(x0.minus_r(home,r,false));
00087     } else if ((x0.max() <= max) && (x0.min() >= min)) {
00088       GECODE_ME_CHECK(b.one_none(home));
00089     } else if ((x0.max() < min) || (x0.min() > max)) {
00090       GECODE_ME_CHECK(b.zero_none(home));
00091     } else {
00092       return ES_FIX;
00093     }
00094     return home.ES_SUBSUMED(*this);
00095   }
00096 
00097 
00098 }}}
00099 
00100 // STATISTICS: int-prop
00101