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minus.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, 2003
00008  *
00009  *  Last modified:
00010  *     $Date: 2010-06-29 10:39:13 +0200 (Tue, 29 Jun 2010) $ by $Author: schulte $
00011  *     $Revision: 11118 $
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 {
00039 
00040   /*
00041    * Constructors and initialization
00042    *
00043    */
00044   forceinline
00045   MinusView::MinusView(void) {}
00046   forceinline
00047   MinusView::MinusView(const IntView& y)
00048     : DerivedView<IntView>(y) {}
00049 
00050 
00051   /*
00052    * Value access
00053    *
00054    */
00055   forceinline int
00056   MinusView::min(void) const {
00057     return -x.max();
00058   }
00059   forceinline int
00060   MinusView::max(void) const {
00061     return -x.min();
00062   }
00063   forceinline int
00064   MinusView::val(void) const {
00065     return -x.val();
00066   }
00067 
00068   forceinline unsigned int
00069   MinusView::width(void) const {
00070     return x.width();
00071   }
00072   forceinline unsigned int
00073   MinusView::size(void) const {
00074     return x.size();
00075   }
00076   forceinline unsigned int
00077   MinusView::regret_min(void) const {
00078     return x.regret_max();
00079   }
00080   forceinline unsigned int
00081   MinusView::regret_max(void) const {
00082     return x.regret_min();
00083   }
00084 
00085 
00086   /*
00087    * Domain tests
00088    *
00089    */
00090   forceinline bool
00091   MinusView::range(void) const {
00092     return x.range();
00093   }
00094   forceinline bool
00095   MinusView::in(int n) const {
00096     return x.in(-n);
00097   }
00098   forceinline bool
00099   MinusView::in(double n) const {
00100     return x.in(-n);
00101   }
00102 
00103 
00104   /*
00105    * Domain update by value
00106    *
00107    */
00108   forceinline ModEvent
00109   MinusView::lq(Space& home, int n) {
00110     return x.gq(home,-n);
00111   }
00112   forceinline ModEvent
00113   MinusView::lq(Space& home, double n) {
00114     return x.gq(home,-n);
00115   }
00116   forceinline ModEvent
00117   MinusView::le(Space& home, int n) {
00118     return x.gr(home,-n);
00119   }
00120   forceinline ModEvent
00121   MinusView::le(Space& home, double n) {
00122     return x.gr(home,-n);
00123   }
00124   forceinline ModEvent
00125   MinusView::gq(Space& home, int n) {
00126     return x.lq(home,-n);
00127   }
00128   forceinline ModEvent
00129   MinusView::gq(Space& home, double n) {
00130     return x.lq(home,-n);
00131   }
00132   forceinline ModEvent
00133   MinusView::gr(Space& home, int n) {
00134     return x.le(home,-n);
00135   }
00136   forceinline ModEvent
00137   MinusView::gr(Space& home, double n) {
00138     return x.le(home,-n);
00139   }
00140   forceinline ModEvent
00141   MinusView::nq(Space& home, int n) {
00142     return x.nq(home,-n);
00143   }
00144   forceinline ModEvent
00145   MinusView::nq(Space& home, double n) {
00146     return x.nq(home,-n);
00147   }
00148   forceinline ModEvent
00149   MinusView::eq(Space& home, int n) {
00150     return x.eq(home,-n);
00151   }
00152   forceinline ModEvent
00153   MinusView::eq(Space& home, double n) {
00154     return x.eq(home,-n);
00155   }
00156 
00157 
00158   /*
00159    * Iterator-based domain update
00160    *
00161    */
00162   template<class I>
00163   forceinline ModEvent
00164   MinusView::narrow_r(Space& home, I& i, bool) {
00165     Iter::Ranges::Minus<I> mi(i);
00166     return x.narrow_r(home,mi,false);
00167   }
00168   template<class I>
00169   forceinline ModEvent
00170   MinusView::inter_r(Space& home, I& i, bool) {
00171     Iter::Ranges::Minus<I> mi(i);
00172     return x.inter_r(home,mi,false);
00173   }
00174   template<class I>
00175   forceinline ModEvent
00176   MinusView::minus_r(Space& home, I& i, bool) {
00177     Iter::Ranges::Minus<I> mi(i);
00178     return x.minus_r(home,mi,false);
00179   }
00180   template<class I>
00181   forceinline ModEvent
00182   MinusView::narrow_v(Space& home, I& i, bool) {
00183     Iter::Values::Minus<I> mi(i);
00184     return x.narrow_v(home,mi,false);
00185   }
00186   template<class I>
00187   forceinline ModEvent
00188   MinusView::inter_v(Space& home, I& i, bool) {
00189     Iter::Values::Minus<I> mi(i);
00190     return x.inter_v(home,mi,false);
00191   }
00192   template<class I>
00193   forceinline ModEvent
00194   MinusView::minus_v(Space& home, I& i, bool) {
00195     Iter::Values::Minus<I> mi(i);
00196     return x.minus_v(home,mi,false);
00197   }
00198 
00199 
00200   /*
00201    * Propagator modification events
00202    *
00203    */
00204   forceinline ModEventDelta
00205   MinusView::med(ModEvent me) {
00206     return IntView::med(me);
00207   }
00208 
00209 
00210   /*
00211    * Delta information for advisors
00212    *
00213    */
00214   forceinline int
00215   MinusView::min(const Delta& d) const {
00216     return -x.max(d);
00217   }
00218   forceinline int
00219   MinusView::max(const Delta& d) const {
00220     return -x.min(d);
00221   }
00222   forceinline bool
00223   MinusView::any(const Delta& d) const {
00224     return x.any(d);
00225   }
00226 
00227 
00232   template<>
00233   class ViewRanges<MinusView> : public IntVarImpBwd {
00234   public:
00236 
00237 
00238     ViewRanges(void);
00240     ViewRanges(const MinusView& x);
00242     void init(const MinusView& x);
00244 
00246 
00247 
00248     int min(void) const;
00250     int max(void) const;
00252   };
00253 
00254   forceinline
00255   ViewRanges<MinusView>::ViewRanges(void) {}
00256 
00257   forceinline
00258   ViewRanges<MinusView>::ViewRanges(const MinusView& x)
00259     : IntVarImpBwd(x.base().varimp()) {}
00260 
00261   forceinline void
00262   ViewRanges<MinusView>::init(const MinusView& x) {
00263     IntVarImpBwd::init(x.base().varimp());
00264   }
00265 
00266   forceinline int
00267   ViewRanges<MinusView>::min(void) const {
00268     return -IntVarImpBwd::max();
00269   }
00270   forceinline int
00271   ViewRanges<MinusView>::max(void) const {
00272     return -IntVarImpBwd::min();
00273   }
00274 
00275   inline int
00276   MinusView::med(void) const {
00277     if (x.range())
00278       return (min()+max())/2 - ((min()+max())%2 < 0 ? 1 : 0);
00279 
00280     unsigned int i = x.size() / 2;
00281     if (size() % 2 == 0)
00282       i--;
00283     ViewRanges<MinusView> r(*this);
00284     while (i >= r.width()) {
00285       i -= r.width();
00286       ++r;
00287     }
00288     return r.min() + static_cast<int>(i);
00289   }
00290 
00291 }}
00292 
00293 // STATISTICS: int-var
00294