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common.hpp

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00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main authors:
00004  *     Guido Tack <tack@gecode.org>
00005  *     Christian Schulte <schulte@gecode.org>
00006  *
00007  *  Contributing authors:
00008  *     Gabor Szokoli <szokoli@gecode.org>
00009  *
00010  *  Copyright:
00011  *     Guido Tack, 2004
00012  *     Christian Schulte, 2004
00013  *     Gabor Szokoli, 2004
00014  *
00015  *  This file is part of Gecode, the generic constraint
00016  *  development environment:
00017  *     http://www.gecode.org
00018  *
00019  *  Permission is hereby granted, free of charge, to any person obtaining
00020  *  a copy of this software and associated documentation files (the
00021  *  "Software"), to deal in the Software without restriction, including
00022  *  without limitation the rights to use, copy, modify, merge, publish,
00023  *  distribute, sublicense, and/or sell copies of the Software, and to
00024  *  permit persons to whom the Software is furnished to do so, subject to
00025  *  the following conditions:
00026  *
00027  *  The above copyright notice and this permission notice shall be
00028  *  included in all copies or substantial portions of the Software.
00029  *
00030  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00031  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00032  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00033  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00034  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00035  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00036  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00037  *
00038  */
00039 
00040 namespace Gecode { namespace Set { namespace Sequence {
00041 
00042   inline ExecStatus
00043   propagateSeq(Space& home, bool& modified, bool& assigned,
00044                ViewArray<SetView>& x) {
00045     int lastElem = x.size()-1;
00046     int cur_max = BndSet::MAX_OF_EMPTY;
00047     int cur_min = BndSet::MIN_OF_EMPTY;
00048 
00049     Region r;
00050     Support::DynamicArray<int,Region> ub(r);
00051 
00052     for (int i=0; i<lastElem; i++) {
00053       if (x[i].glbSize() > 0)
00054         cur_max = std::max(cur_max, x[i].glbMax());
00055       if (x[i].cardMin() > 0)
00056         cur_max = std::max(cur_max, x[i].lubMinN(x[i].cardMin()-1));
00057       if (cur_max >= Limits::min)
00058         GECODE_SET_ME_CHECK_VAL_B(modified,
00059                                   x[i+1].exclude(home, Limits::min,
00060                                                  cur_max),
00061                                   assigned);
00062 
00063       if (x[lastElem-i].lubSize() > 0) {
00064         cur_min = std::min(cur_min, x[lastElem-i].glbMin());
00065         if (x[lastElem-i].cardMin() > 0) {
00066           // Compute n-th largest element in x[lastElem-i].lub
00067           // for n = x[lastElem-i].cardMin()-1
00068           int maxN = BndSet::MAX_OF_EMPTY;
00069           int j=0;
00070           for (LubRanges<SetView> ubr(x[lastElem-i]); ubr(); ++ubr, ++j) {
00071             ub[2*j]=ubr.min(); ub[2*j+1]=ubr.max();
00072           }
00073           unsigned int xcm = x[lastElem-i].cardMin()-1;
00074           while (j--) {
00075             unsigned int width = static_cast<unsigned int>(ub[2*j+1]-ub[2*j]+1);
00076             if (width > xcm) {
00077               maxN = static_cast<int>(ub[2*j+1]-xcm);
00078               break;
00079             }
00080             xcm -= width;
00081           }
00082           cur_min = std::min(cur_min, maxN);
00083         }
00084       }
00085       if (Limits::max>=cur_min)
00086         GECODE_SET_ME_CHECK_VAL_B(modified,
00087                                   x[lastElem-i-1].exclude(home, cur_min,
00088                                                           Limits::max),
00089                                   assigned);
00090     }
00091     return ES_NOFIX;
00092   }
00093 
00094 }}}
00095 
00096 // STATISTICS: set-prop