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view-lq.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, 2003
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 Count {
00035 
00036   template<class VX, class VY, class VZ, bool shr>
00037   forceinline
00038   LqView<VX,VY,VZ,shr>::LqView(Home home, ViewArray<VX>& x,
00039                                VY y, VZ z, int c)
00040     : ViewBase<VX,VY,VZ>(home,x,y,z,c) {}
00041 
00042   template<class VX, class VY, class VZ, bool shr>
00043   ExecStatus
00044   LqView<VX,VY,VZ,shr>::post(Home home, ViewArray<VX>& x,
00045                              VY y, VZ z, int c) {
00046     GECODE_ME_CHECK(z.gq(home,-c));
00047     if (z.assigned())
00048       return LqInt<VX,VY>::post(home,x,y,z.val()+c);
00049     if (sharing(x,y,z))
00050       (void) new (home) LqView<VX,VY,VZ,true>(home,x,y,z,c);
00051     else
00052       (void) new (home) LqView<VX,VY,VZ,false>(home,x,y,z,c);
00053     return ES_OK;
00054   }
00055 
00056   template<class VX, class VY, class VZ, bool shr>
00057   forceinline
00058   LqView<VX,VY,VZ,shr>::LqView(Space& home, LqView<VX,VY,VZ,shr>& p)
00059     : ViewBase<VX,VY,VZ>(home,p) {}
00060 
00061   template<class VX, class VY, class VZ, bool shr>
00062   Actor*
00063   LqView<VX,VY,VZ,shr>::copy(Space& home) {
00064     return new (home) LqView<VX,VY,VZ,shr>(home,*this);
00065   }
00066 
00067   template<class VX, class VY, class VZ, bool shr>
00068   ExecStatus
00069   LqView<VX,VY,VZ,shr>::propagate(Space& home, const ModEventDelta&) {
00070     count(home);
00071     GECODE_ME_CHECK(z.gq(home,atleast()));
00072 
00073     if (z.max() == atleast()) {
00074       GECODE_ES_CHECK(post_false(home,x,y));
00075       return home.ES_SUBSUMED(*this);
00076     }
00077 
00078     if (x.size() == 0)
00079       return home.ES_SUBSUMED(*this);
00080 
00081     if (z.assigned()) {
00082       VY yc(y);
00083       GECODE_REWRITE(*this,(LqInt<VX,VY>::post(home(*this),x,yc,z.val()+c)));
00084     }
00085 
00086     return shr ? ES_NOFIX : ES_FIX;
00087   }
00088 
00089 }}}
00090 
00091 // STATISTICS: int-prop