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float-rel.hpp

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00001 /* -*- mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*- */
00002 /*
00003  *  Main authors:
00004  *     Vincent Barichard <Vincent.Barichard@univ-angers.fr>
00005  *
00006  *  Copyright:
00007  *     Vincent Barichard, 2012
00008  *
00009  *  Last modified:
00010  *     $Date: 2013-01-22 13:48:12 +0100 (Tue, 22 Jan 2013) $ by $Author: schulte $
00011  *     $Revision: 13227 $
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
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00035  *
00036  */
00037 
00038 #ifdef GECODE_HAS_FLOAT_VARS
00039 
00040 namespace Gecode {
00041 
00042   /*
00043    * Operations for linear float relations
00044    *
00045    */
00046   forceinline
00047   LinFloatRel::LinFloatRel(void) {}
00048 
00049   forceinline
00050   LinFloatRel::LinFloatRel(const LinFloatExpr& l, FloatRelType frt0, const LinFloatExpr& r)
00051     : e(l-r), frt(frt0) {}
00052 
00053   forceinline
00054   LinFloatRel::LinFloatRel(const LinFloatExpr& l, FloatRelType frt0, FloatVal r)
00055     : e(l-r), frt(frt0) {}
00056 
00057   forceinline
00058   LinFloatRel::LinFloatRel(FloatVal l, FloatRelType frt0, const LinFloatExpr& r)
00059     : e(l-r), frt(frt0) {}
00060 
00061   forceinline FloatRelType
00062   LinFloatRel::neg(FloatRelType frt) {
00063     switch (frt) {
00064     case FRT_EQ: return FRT_NQ;
00065     case FRT_NQ: return FRT_EQ;
00066     case FRT_LQ: return FRT_GR;
00067     case FRT_LE: return FRT_GQ;
00068     case FRT_GQ: return FRT_LE;
00069     case FRT_GR: return FRT_LQ;
00070     default: GECODE_NEVER;
00071     }
00072     return FRT_LQ;
00073   }
00074 
00075   forceinline void
00076   LinFloatRel::post(Home home, bool t) const {
00077     e.post(home,t ? frt : neg(frt));
00078   }
00079 
00080   forceinline void
00081   LinFloatRel::post(Home home, const BoolVar& b, bool t) const {
00082     e.post(home,t ? frt : neg(frt),b);
00083   }
00084 
00085 }
00086 
00087 #endif
00088 
00089 // STATISTICS: minimodel-any