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pair.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, 2009
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 #include <gecode/int/rel.hh>
00035 
00036 namespace Gecode { namespace Int { namespace Element {
00037 
00038   forceinline
00039   Pair::Pair(Home home, IntView x0, IntView x1, IntView x2, int w0)
00040     : TernaryPropagator<IntView,PC_INT_DOM>(home,x0,x1,x2), w(w0) {}
00041 
00042   inline ExecStatus
00043   Pair::post(Home home, IntView x0, IntView x1, IntView x2,
00044              int w, int h) {
00045     GECODE_ME_CHECK(x0.gq(home,0)); GECODE_ME_CHECK(x0.le(home,w));
00046     GECODE_ME_CHECK(x1.gq(home,0)); GECODE_ME_CHECK(x1.le(home,h));
00047     GECODE_ME_CHECK(x2.gq(home,0)); GECODE_ME_CHECK(x2.le(home,w*h));
00048     if (x0.assigned() && x1.assigned()) {
00049       GECODE_ME_CHECK(x2.eq(home,x0.val()+w*x1.val()));
00050     } else if (x1.assigned()) {
00051       OffsetView x0x1w(x0,x1.val()*w);
00052       return Rel::EqDom<OffsetView,IntView>::post(home,x0x1w,x2);
00053     } else if (x2.assigned()) {
00054       GECODE_ME_CHECK(x0.eq(home,x2.val() % w));
00055       GECODE_ME_CHECK(x1.eq(home,static_cast<int>(x2.val() / w)));
00056     } else {
00057       assert(!shared(x0,x2) && !shared(x1,x2));
00058       (void) new (home) Pair(home,x0,x1,x2,w);
00059     }
00060     return ES_OK;
00061   }
00062 
00063   forceinline
00064   Pair::Pair(Space& home, Pair& p)
00065     : TernaryPropagator<IntView,PC_INT_DOM>(home,p), w(p.w) {}
00066 
00067 }}}
00068 
00069 // STATISTICS: int-prop
00070