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violations.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, 2009
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 #include <climits>
00035 #include <cmath>
00036 
00037 namespace Gecode { namespace Int { namespace Sequence {
00038 
00040   class Violations : public Support::BitSetBase {
00041   protected:
00043     mutable unsigned int fst;
00044   public:
00046     Violations(void);
00048     void init(Space& home, unsigned int n);
00050     void update(Space& home, Violations& v);
00052     bool empty(void) const;
00054     void add(unsigned int i);
00056     unsigned int get(void);
00057   };
00058 
00059 
00060   forceinline
00061   Violations::Violations(void) : fst(0) {}
00062 
00063   forceinline void
00064   Violations::init(Space& home, unsigned int n) {
00065     Support::BitSetBase::init(home,n);
00066     fst=size();
00067   }
00068 
00069   forceinline bool
00070   Violations::empty(void) const {
00071     fst = next(fst);
00072     return fst >= size();
00073   }
00074 
00075   forceinline void
00076   Violations::update(Space& home, Violations& v) {
00077     assert(v.empty());
00078     init(home,v.size());
00079   }
00080 
00081   forceinline void
00082   Violations::add(unsigned int i) {
00083     set(i); if (i < fst) fst = i;
00084   }
00085 
00086   forceinline unsigned int
00087   Violations::get(void) {
00088     assert(!empty());
00089     fst = next(fst);
00090     assert(Support::BitSetBase::get(fst));
00091     clear(fst); fst++;
00092     return fst-1;
00093   }
00094 
00095 }}}
00096 
00097 // STATISTICS: int-prop