range.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, 2004 00008 * 00009 * Last modified: 00010 * $Date: 2010-03-03 17:32:21 +0100 (Wed, 03 Mar 2010) $ by $Author: schulte $ 00011 * $Revision: 10364 $ 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 #include <gecode/int/rel.hh> 00039 00040 namespace Gecode { namespace Int { namespace Dom { 00041 00042 template<class View> 00043 forceinline 00044 ReRange<View>::ReRange(Home home, View x, int min0, int max0, BoolView b) 00045 : ReUnaryPropagator<View,PC_INT_BND,BoolView>(home,x,b), 00046 min(min0), max(max0) {} 00047 00048 template<class View> 00049 ExecStatus 00050 ReRange<View>::post(Home home, View x, int min, int max, BoolView b) { 00051 if (min > max) { 00052 return ES_FAILED; 00053 } else if (min == max) { 00054 return Rel::ReEqDomInt<View,BoolView>::post(home,x,min,b); 00055 } else if ((max < x.min()) || (min > x.max())) { 00056 GECODE_ME_CHECK(b.zero(home)); 00057 } else if ((min <= x.min()) && (x.max() <= max)) { 00058 GECODE_ME_CHECK(b.one(home)); 00059 } else { 00060 (void) new (home) ReRange<View>(home,x,min,max,b); 00061 } 00062 return ES_OK; 00063 } 00064 00065 00066 template<class View> 00067 forceinline 00068 ReRange<View>::ReRange(Space& home, bool share, ReRange& p) 00069 : ReUnaryPropagator<View,PC_INT_BND,BoolView>(home,share,p), 00070 min(p.min), max(p.max) {} 00071 00072 template<class View> 00073 Actor* 00074 ReRange<View>::copy(Space& home, bool share) { 00075 return new (home) ReRange<View>(home,share,*this); 00076 } 00077 00078 template<class View> 00079 ExecStatus 00080 ReRange<View>::propagate(Space& home, const ModEventDelta&) { 00081 if (b.one()) { 00082 GECODE_ME_CHECK(x0.gq(home,min)); 00083 GECODE_ME_CHECK(x0.lq(home,max)); 00084 } else if (b.zero()) { 00085 Iter::Ranges::Singleton r(min,max); 00086 GECODE_ME_CHECK(x0.minus_r(home,r,false)); 00087 } else if ((x0.max() <= max) && (x0.min() >= min)) { 00088 GECODE_ME_CHECK(b.one_none(home)); 00089 } else if ((x0.max() < min) || (x0.min() > max)) { 00090 GECODE_ME_CHECK(b.zero_none(home)); 00091 } else { 00092 return ES_FIX; 00093 } 00094 return home.ES_SUBSUMED(*this); 00095 } 00096 00097 00098 }}} 00099 00100 // STATISTICS: int-prop 00101