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support-values.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, 2008
00008  *
00009  *  Last modified:
00010  *     $Date: 2010-01-28 17:13:59 +0100 (Thu, 28 Jan 2010) $ by $Author: schulte $
00011  *     $Revision: 10244 $
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   template<class View, class A>
00041   forceinline void
00042   SupportValues<View,A>::reset(void) {
00043     rp = rp_fst; v = rp->min;
00044     max = rp->min + static_cast<int>((rp+1)->pos - rp->pos) - 1;
00045   }
00046 
00047   template<class View, class A>
00048   inline
00049   SupportValues<View,A>::SupportValues(A& a0, View x0)
00050     : a(a0), x(x0), bs(a,x.size(),true) {
00051     unsigned int n = 0;
00052     for (ViewRanges<View> r(x); r(); ++r)
00053       n++;
00054     rp_fst = a.template alloc<RangePos>(n+1);
00055     rp_lst = rp_fst + n;
00056     unsigned int p = 0;
00057     int i = 0;
00058     for (ViewRanges<View> r(x); r(); ++r) {
00059       rp_fst[i].min = r.min();
00060       rp_fst[i].pos = p;
00061       p += r.width(); i++;
00062     }
00063     rp_fst[i].pos=p;
00064     reset();
00065   }
00066 
00067   template<class View, class A>
00068   forceinline
00069   SupportValues<View,A>::~SupportValues(void) {
00070     bs.dispose(a);
00071     a.free(rp_fst,static_cast<unsigned long int>(rp_lst-rp_fst+1));
00072   }
00073 
00074   template<class View, class A>
00075   forceinline void
00076   SupportValues<View,A>::operator ++(void) {
00077     if (++v > max)
00078       if (++rp < rp_lst) {
00079         v = rp->min;
00080         max = rp->min + static_cast<int>((rp+1)->pos - rp->pos) - 1;
00081       }
00082   }
00083 
00084   template<class View, class A>
00085   forceinline bool
00086   SupportValues<View,A>::operator ()(void) const {
00087     return rp < rp_lst;
00088   }
00089 
00090   template<class View, class A>
00091   forceinline int
00092   SupportValues<View,A>::val(void) const {
00093     return v;
00094   }
00095 
00096   template<class View, class A>
00097   forceinline void
00098   SupportValues<View,A>::support(void) {
00099     bs.clear(rp->pos + static_cast<unsigned int>(v-rp->min));
00100   }
00101 
00102   template<class View, class A>
00103   forceinline bool
00104   SupportValues<View,A>::_support(int n) {
00105     RangePos* l = rp_fst;
00106     RangePos* r = rp_lst-1;
00107     while (true) {
00108       if (l > r) return false;
00109       RangePos* m = l + (r-l)/2;
00110       int max = m->min + static_cast<int>((m+1)->pos - m->pos) - 1;
00111       if ((n >= m->min) && (n <= max)) {
00112         bs.clear(m->pos + static_cast<unsigned int>(n-m->min));
00113         return true;
00114       }
00115       if (l == r) return false;
00116       if (n < m->min)
00117         r=m-1;
00118       else
00119         l=m+1;
00120     }
00121     GECODE_NEVER;
00122     return false;
00123   }
00124 
00125   template<class View, class A>
00126   forceinline bool
00127   SupportValues<View,A>::support(int n) {
00128     if ((n < x.min()) || (n > x.max()))
00129       return false;
00130     return _support(n);
00131   }
00132 
00133   template<class View, class A>
00134   forceinline bool
00135   SupportValues<View,A>::support(double n) {
00136     if ((n < x.min()) || (n > x.max()))
00137       return false;
00138     return _support(static_cast<int>(n));
00139   }
00140 
00141   template<class View, class A>
00142   forceinline void
00143   SupportValues<View,A>::Unsupported::find(void) {
00144     // Skip all supported positions
00145     while ((p < sv.x.size()) && !sv.bs.get(p))
00146       p = sv.bs.next(p);
00147     // Move to matching range
00148     while ((rp < sv.rp_lst) && (p >= (rp+1)->pos))
00149       rp++;
00150   }
00151 
00152   template<class View, class A>
00153   forceinline
00154   SupportValues<View,A>::Unsupported::Unsupported(SupportValues& sv0)
00155     : rp(sv0.rp_fst), p(0), sv(sv0) {
00156     find();
00157   }
00158 
00159   template<class View, class A>
00160   forceinline void
00161   SupportValues<View,A>::Unsupported::operator ++(void) {
00162     p++; find();
00163   }
00164 
00165   template<class View, class A>
00166   forceinline bool
00167   SupportValues<View,A>::Unsupported::operator ()(void) const {
00168     return rp < sv.rp_lst;
00169   }
00170 
00171   template<class View, class A>
00172   forceinline int
00173   SupportValues<View,A>::Unsupported::val(void) const {
00174     return static_cast<int>(rp->min+(p-rp->pos));
00175   }
00176 
00177   template<class View, class A>
00178   inline ModEvent
00179   SupportValues<View,A>::tell(Space& home) {
00180     Unsupported u(*this);
00181     return x.minus_v(home,u,false);
00182   }
00183 
00184 }}
00185 
00186 // STATISTICS: int-prop
00187