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zero.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: 2010-07-28 17:35:33 +0200 (Wed, 28 Jul 2010) $ by $Author: schulte $
00011  *     $Revision: 11294 $
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   ZeroIntView::ZeroIntView(void) {}
00046 
00047   /*
00048    * Value access
00049    *
00050    */
00051   forceinline int
00052   ZeroIntView::min(void) const {
00053     return 0;
00054   }
00055   forceinline int
00056   ZeroIntView::max(void) const {
00057     return 0;
00058   }
00059   forceinline int
00060   ZeroIntView::med(void) const {
00061     return 0;
00062   }
00063   forceinline int
00064   ZeroIntView::val(void) const {
00065     return 0;
00066   }
00067 
00068   forceinline unsigned int
00069   ZeroIntView::size(void) const {
00070     return 1;
00071   }
00072   forceinline unsigned int
00073   ZeroIntView::width(void) const {
00074     return 1;
00075   }
00076   forceinline unsigned int
00077   ZeroIntView::regret_min(void) const {
00078     return 0;
00079   }
00080   forceinline unsigned int
00081   ZeroIntView::regret_max(void) const {
00082     return 0;
00083   }
00084 
00085 
00086   /*
00087    * Domain tests
00088    *
00089    */
00090   forceinline bool
00091   ZeroIntView::range(void) const {
00092     return true;
00093   }
00094   forceinline bool
00095   ZeroIntView::in(int n) const {
00096     return n == 0;
00097   }
00098   forceinline bool
00099   ZeroIntView::in(double n) const {
00100     return n == 0;
00101   }
00102 
00103 
00104   /*
00105    * Domain update by value
00106    *
00107    */
00108   forceinline ModEvent
00109   ZeroIntView::lq(Space&, int n) {
00110     return (0 <= n) ? ME_INT_NONE : ME_INT_FAILED;
00111   }
00112   forceinline ModEvent
00113   ZeroIntView::lq(Space&, double n) {
00114     return (0 <= n) ? ME_INT_NONE : ME_INT_FAILED;
00115   }
00116 
00117   forceinline ModEvent
00118   ZeroIntView::le(Space&, int n) {
00119     return (0 < n) ? ME_INT_NONE : ME_INT_FAILED;
00120   }
00121   forceinline ModEvent
00122   ZeroIntView::le(Space&, double n) {
00123     return (0 < n) ? ME_INT_NONE : ME_INT_FAILED;
00124   }
00125 
00126   forceinline ModEvent
00127   ZeroIntView::gq(Space&, int n) {
00128     return (0 >= n) ? ME_INT_NONE : ME_INT_FAILED;
00129   }
00130   forceinline ModEvent
00131   ZeroIntView::gq(Space&, double n) {
00132     return (0 >= n) ? ME_INT_NONE : ME_INT_FAILED;
00133   }
00134 
00135   forceinline ModEvent
00136   ZeroIntView::gr(Space&, int n) {
00137     return (0 > n) ? ME_INT_NONE : ME_INT_FAILED;
00138   }
00139   forceinline ModEvent
00140   ZeroIntView::gr(Space&, double n) {
00141     return (0 > n) ? ME_INT_NONE : ME_INT_FAILED;
00142   }
00143 
00144   forceinline ModEvent
00145   ZeroIntView::nq(Space&, int n) {
00146     return (0 != n) ? ME_INT_NONE : ME_INT_FAILED;
00147   }
00148   forceinline ModEvent
00149   ZeroIntView::nq(Space&, double n) {
00150     return (0 != n) ? ME_INT_NONE : ME_INT_FAILED;
00151   }
00152 
00153   forceinline ModEvent
00154   ZeroIntView::eq(Space&, int n) {
00155     return (0 == n) ? ME_INT_NONE : ME_INT_FAILED;
00156   }
00157   forceinline ModEvent
00158   ZeroIntView::eq(Space&, double n) {
00159     return (0 == n) ? ME_INT_NONE : ME_INT_FAILED;
00160   }
00161 
00162 
00163 
00164   /*
00165    * Iterator-based domain update
00166    *
00167    */
00168   template<class I>
00169   forceinline ModEvent
00170   ZeroIntView::narrow_r(Space&, I& i, bool) {
00171     return i() ? ME_INT_NONE : ME_INT_FAILED;
00172   }
00173   template<class I>
00174   forceinline ModEvent
00175   ZeroIntView::inter_r(Space&, I& i, bool) {
00176     while (i() && (i.max() < 0))
00177       ++i;
00178     return (i() && (i.min() <= 0)) ? ME_INT_NONE : ME_INT_FAILED;
00179   }
00180   template<class I>
00181   forceinline ModEvent
00182   ZeroIntView::minus_r(Space&, I& i, bool) {
00183     while (i() && (i.max() < 0))
00184       ++i;
00185     return (i() && (i.min() <= 0)) ? ME_INT_FAILED : ME_INT_NONE;
00186   }
00187   template<class I>
00188   forceinline ModEvent
00189   ZeroIntView::narrow_v(Space&, I& i, bool) {
00190     return i() ? ME_INT_NONE : ME_INT_FAILED;
00191   }
00192   template<class I>
00193   forceinline ModEvent
00194   ZeroIntView::inter_v(Space&, I& i, bool) {
00195     while (i() && (i.val() < 0))
00196       ++i;
00197     return (i() && (i.val() == 0)) ? ME_INT_NONE : ME_INT_FAILED;
00198   }
00199   template<class I>
00200   forceinline ModEvent
00201   ZeroIntView::minus_v(Space&, I& i, bool) {
00202     while (i() && (i.val() < 0))
00203       ++i;
00204     return (i() && (i.val() == 0)) ? ME_INT_FAILED : ME_INT_NONE;
00205   }
00206 
00207   /*
00208    * Delta information for advisors
00209    *
00210    */
00211   forceinline int
00212   ZeroIntView::min(const Delta&) const {
00213     return 1;
00214   }
00215   forceinline int
00216   ZeroIntView::max(const Delta&) const {
00217     return 0;
00218   }
00219   forceinline bool
00220   ZeroIntView::any(const Delta&) const {
00221     return true;
00222   }
00223 
00224 
00229   template<>
00230   class ViewRanges<ZeroIntView> {
00231   private:
00233     bool done;
00234   public:
00236 
00237 
00238     ViewRanges(void);
00240     ViewRanges(const ZeroIntView& x);
00242     void init(const ZeroIntView& x);
00244 
00246 
00247 
00248     bool operator ()(void) const;
00250     void operator ++(void);
00252 
00254 
00255 
00256     int min(void) const;
00258     int max(void) const;
00260     unsigned int width(void) const;
00262   };
00263 
00264   forceinline
00265   ViewRanges<ZeroIntView>::ViewRanges(void) {}
00266 
00267   forceinline
00268   ViewRanges<ZeroIntView>::ViewRanges(const ZeroIntView&)
00269     : done(false) {}
00270 
00271   forceinline bool
00272   ViewRanges<ZeroIntView>::operator ()(void) const {
00273     return !done;
00274   }
00275   forceinline void
00276   ViewRanges<ZeroIntView>::operator ++(void) {
00277     done=true;
00278   }
00279 
00280   forceinline int
00281   ViewRanges<ZeroIntView>::min(void) const {
00282     return 0;
00283   }
00284   forceinline int
00285   ViewRanges<ZeroIntView>::max(void) const {
00286     return 0;
00287   }
00288   forceinline unsigned int
00289   ViewRanges<ZeroIntView>::width(void) const {
00290     return 1;
00291   }
00292 
00293   /*
00294    * View comparison
00295    *
00296    */
00297   forceinline bool
00298   same(const ZeroIntView&, const ZeroIntView&) {
00299     return true;
00300   }
00301 
00302 }}
00303 
00304 // STATISTICS: int-var
00305