view-lq.hpp

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  *  Last modified:
00010  *     $Date: 2011-08-29 14:59:24 +0200 (Mon, 29 Aug 2011) $ by $Author: schulte $
00011  *     $Revision: 12359 $
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 namespace Gecode { namespace Int { namespace Count {
00039 
00040   template<class VX, class VY, class VZ, bool shr>
00041   forceinline
00042   LqView<VX,VY,VZ,shr>::LqView(Home home, ViewArray<VX>& x,
00043                                VY y, VZ z, int c)
00044     : ViewBase<VX,VY,VZ>(home,x,y,z,c) {}
00045 
00046   template<class VX, class VY, class VZ, bool shr>
00047   ExecStatus
00048   LqView<VX,VY,VZ,shr>::post(Home home, ViewArray<VX>& x,
00049                              VY y, VZ z, int c) {
00050     GECODE_ME_CHECK(z.gq(home,-c));
00051     if (z.assigned())
00052       return LqInt<VX,VY>::post(home,x,y,z.val()+c);
00053     if (sharing(x,y,z))
00054       (void) new (home) LqView<VX,VY,VZ,true>(home,x,y,z,c);
00055     else
00056       (void) new (home) LqView<VX,VY,VZ,false>(home,x,y,z,c);
00057     return ES_OK;
00058   }
00059 
00060   template<class VX, class VY, class VZ, bool shr>
00061   forceinline
00062   LqView<VX,VY,VZ,shr>::LqView(Space& home, bool share,
00063                                LqView<VX,VY,VZ,shr>& p)
00064     : ViewBase<VX,VY,VZ>(home,share,p) {}
00065 
00066   template<class VX, class VY, class VZ, bool shr>
00067   Actor*
00068   LqView<VX,VY,VZ,shr>::copy(Space& home, bool share) {
00069     return new (home) LqView<VX,VY,VZ,shr>(home,share,*this);
00070   }
00071 
00072   template<class VX, class VY, class VZ, bool shr>
00073   ExecStatus
00074   LqView<VX,VY,VZ,shr>::propagate(Space& home, const ModEventDelta&) {
00075     count(home);
00076     GECODE_ME_CHECK(z.gq(home,atleast()));
00077 
00078     if (z.max() == atleast()) {
00079       GECODE_ES_CHECK(post_false(home,x,y));
00080       return home.ES_SUBSUMED(*this);
00081     }
00082 
00083     if (x.size() == 0)
00084       return home.ES_SUBSUMED(*this);
00085 
00086     if (z.assigned()) {
00087       VY yc(y);
00088       GECODE_REWRITE(*this,(LqInt<VX,VY>::post(home(*this),x,yc,z.val()+c)));
00089     }
00090 
00091     return shr ? ES_NOFIX : ES_FIX;
00092   }
00093 
00094 }}}
00095 
00096 // STATISTICS: int-prop