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channel.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  *     Vincent Barichard <Vincent.Barichard@univ-angers.fr>
00006  *
00007  *  Copyright:
00008  *     Christian Schulte, 2004
00009  *     Vincent Barichard, 2012
00010  *
00011  *  This file is part of Gecode, the generic constraint
00012  *  development environment:
00013  *     http://www.gecode.org
00014  *
00015  *  Permission is hereby granted, free of charge, to any person obtaining
00016  *  a copy of this software and associated documentation files (the
00017  *  "Software"), to deal in the Software without restriction, including
00018  *  without limitation the rights to use, copy, modify, merge, publish,
00019  *  distribute, sublicense, and/or sell copies of the Software, and to
00020  *  permit persons to whom the Software is furnished to do so, subject to
00021  *  the following conditions:
00022  *
00023  *  The above copyright notice and this permission notice shall be
00024  *  included in all copies or substantial portions of the Software.
00025  *
00026  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00027  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00028  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00029  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00030  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00031  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00032  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00033  *
00034  */
00035 
00036 namespace Gecode { namespace Float { namespace Channel {
00037 
00038   template<class A, class B>
00039   forceinline
00040   Channel<A,B>::Channel(Home home, A x0, B x1)
00041     : MixBinaryPropagator<A,PC_FLOAT_BND,B,Int::PC_INT_BND>(home,x0,x1) {}
00042 
00043   template<class A, class B>
00044   forceinline
00045   Channel<A,B>::Channel(Space& home, Channel<A,B>& p)
00046     : MixBinaryPropagator<A,PC_FLOAT_BND,B,Int::PC_INT_BND>(home,p) {}
00047 
00048   template<class A, class B>
00049   Actor*
00050   Channel<A,B>::copy(Space& home) {
00051     return new (home) Channel<A,B>(home,*this);
00052   }
00053 
00054   template<class A, class B>
00055   ExecStatus
00056   Channel<A,B>::post(Home home, A x0, B x1) {
00057     GECODE_ME_CHECK(x0.eq(home,FloatVal(Int::Limits::min,
00058                                         Int::Limits::max)));
00059     GECODE_ME_CHECK(x1.gq(home,static_cast<int>(std::ceil(x0.min()))));
00060     GECODE_ME_CHECK(x1.lq(home,static_cast<int>(std::floor(x0.max()))));
00061     GECODE_ME_CHECK(x0.eq(home,FloatVal(x1.min(),x1.max())));
00062     (void) new (home) Channel<A,B>(home,x0,x1);
00063     return ES_OK;
00064   }
00065 
00066   template<class A, class B>
00067   ExecStatus
00068   Channel<A,B>::propagate(Space& home, const ModEventDelta&) {
00069     GECODE_ME_CHECK(x1.gq(home,static_cast<int>(std::ceil(x0.min()))));
00070     GECODE_ME_CHECK(x1.lq(home,static_cast<int>(std::floor(x0.max()))));
00071     GECODE_ME_CHECK(x0.eq(home,FloatVal(x1.min(),x1.max())));
00072     return x0.assigned() ? home.ES_SUBSUMED(*this) : ES_FIX;
00073   }
00074 
00075 }}}
00076 
00077 // STATISTICS: float-prop
00078