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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  *  This file is part of Gecode, the generic constraint
00010  *  development environment:
00011  *     http://www.gecode.org
00012  *
00013  *  Permission is hereby granted, free of charge, to any person obtaining
00014  *  a copy of this software and associated documentation files (the
00015  *  "Software"), to deal in the Software without restriction, including
00016  *  without limitation the rights to use, copy, modify, merge, publish,
00017  *  distribute, sublicense, and/or sell copies of the Software, and to
00018  *  permit persons to whom the Software is furnished to do so, subject to
00019  *  the following conditions:
00020  *
00021  *  The above copyright notice and this permission notice shall be
00022  *  included in all copies or substantial portions of the Software.
00023  *
00024  *  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
00025  *  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
00026  *  MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
00027  *  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
00028  *  LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
00029  *  OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
00030  *  WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
00031  *
00032  */
00033 
00034 namespace Gecode { namespace Int {
00035 
00036   template<class View, class A>
00037   forceinline void
00038   SupportValues<View,A>::reset(void) {
00039     rp = rp_fst; v = rp->min;
00040     max = rp->min + static_cast<int>((rp+1)->pos - rp->pos) - 1;
00041   }
00042 
00043   template<class View, class A>
00044   inline
00045   SupportValues<View,A>::SupportValues(A& a0, View x0)
00046     : a(a0), x(x0), bs(a,x.size(),true) {
00047     unsigned int n = 0;
00048     for (ViewRanges<View> r(x); r(); ++r)
00049       n++;
00050     rp_fst = a.template alloc<RangePos>(n+1);
00051     rp_lst = rp_fst + n;
00052     unsigned int p = 0;
00053     int i = 0;
00054     for (ViewRanges<View> r(x); r(); ++r) {
00055       rp_fst[i].min = r.min();
00056       rp_fst[i].pos = p;
00057       p += r.width(); i++;
00058     }
00059     rp_fst[i].pos=p;
00060     reset();
00061   }
00062 
00063   template<class View, class A>
00064   forceinline
00065   SupportValues<View,A>::~SupportValues(void) {
00066     bs.dispose(a);
00067     a.free(rp_fst,static_cast<unsigned long int>(rp_lst-rp_fst+1));
00068   }
00069 
00070   template<class View, class A>
00071   forceinline void
00072   SupportValues<View,A>::operator ++(void) {
00073     if (++v > max)
00074       if (++rp < rp_lst) {
00075         v = rp->min;
00076         max = rp->min + static_cast<int>((rp+1)->pos - rp->pos) - 1;
00077       }
00078   }
00079 
00080   template<class View, class A>
00081   forceinline bool
00082   SupportValues<View,A>::operator ()(void) const {
00083     return rp < rp_lst;
00084   }
00085 
00086   template<class View, class A>
00087   forceinline int
00088   SupportValues<View,A>::val(void) const {
00089     return v;
00090   }
00091 
00092   template<class View, class A>
00093   forceinline void
00094   SupportValues<View,A>::support(void) {
00095     bs.clear(rp->pos + static_cast<unsigned int>(v-rp->min));
00096   }
00097 
00098   template<class View, class A>
00099   forceinline bool
00100   SupportValues<View,A>::_support(int n) {
00101     RangePos* l = rp_fst;
00102     RangePos* r = rp_lst-1;
00103     while (true) {
00104       if (l > r) return false;
00105       RangePos* m = l + (r-l)/2;
00106       int max = m->min + static_cast<int>((m+1)->pos - m->pos) - 1;
00107       if ((n >= m->min) && (n <= max)) {
00108         bs.clear(m->pos + static_cast<unsigned int>(n-m->min));
00109         return true;
00110       }
00111       if (l == r) return false;
00112       if (n < m->min)
00113         r=m-1;
00114       else
00115         l=m+1;
00116     }
00117     GECODE_NEVER;
00118     return false;
00119   }
00120 
00121   template<class View, class A>
00122   forceinline bool
00123   SupportValues<View,A>::support(int n) {
00124     if ((n < x.min()) || (n > x.max()))
00125       return false;
00126     return _support(n);
00127   }
00128 
00129   template<class View, class A>
00130   forceinline bool
00131   SupportValues<View,A>::support(long long int n) {
00132     if ((n < x.min()) || (n > x.max()))
00133       return false;
00134     return _support(static_cast<int>(n));
00135   }
00136 
00137   template<class View, class A>
00138   forceinline void
00139   SupportValues<View,A>::Unsupported::find(void) {
00140     // Skip all supported positions
00141     while ((p < sv.x.size()) && !sv.bs.get(p))
00142       p = sv.bs.next(p);
00143     // Move to matching range
00144     while ((rp < sv.rp_lst) && (p >= (rp+1)->pos))
00145       rp++;
00146   }
00147 
00148   template<class View, class A>
00149   forceinline
00150   SupportValues<View,A>::Unsupported::Unsupported(SupportValues& sv0)
00151     : rp(sv0.rp_fst), p(0), sv(sv0) {
00152     find();
00153   }
00154 
00155   template<class View, class A>
00156   forceinline void
00157   SupportValues<View,A>::Unsupported::operator ++(void) {
00158     p++; find();
00159   }
00160 
00161   template<class View, class A>
00162   forceinline bool
00163   SupportValues<View,A>::Unsupported::operator ()(void) const {
00164     return rp < sv.rp_lst;
00165   }
00166 
00167   template<class View, class A>
00168   forceinline int
00169   SupportValues<View,A>::Unsupported::val(void) const {
00170     return static_cast<int>(rp->min+(p-rp->pos));
00171   }
00172 
00173   template<class View, class A>
00174   inline ModEvent
00175   SupportValues<View,A>::tell(Space& home) {
00176     Unsupported u(*this);
00177     return x.minus_v(home,u,false);
00178   }
00179 
00180 }}
00181 
00182 // STATISTICS: int-prop
00183