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lds.hh

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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, 2004, 2016
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 #ifndef __GECODE_SEARCH_SEQ_LDS_HH__
00035 #define __GECODE_SEARCH_SEQ_LDS_HH__
00036 
00037 #include <gecode/search.hh>
00038 #include <gecode/search/support.hh>
00039 #include <gecode/search/worker.hh>
00040 
00041 namespace Gecode { namespace Search { namespace Seq {
00042 
00044   template<class Tracer>
00045   class Probe : public Worker {
00046   protected:
00048     typedef typename Tracer::ID ID;
00050     class Node {
00051     private:
00053       Space* _space;
00055       const Choice* _choice;
00057       unsigned int _alt;
00059       ID _nid;
00060     public:
00062       Node(void);
00064       Node(Space* s, const Choice* c, unsigned int a, unsigned int nid);
00066       Space* space(void) const;
00068       const Choice* choice(void) const;
00070       unsigned int alt(void) const;
00072       unsigned int nid(void) const;
00074       void next(void);
00075     };
00077     Tracer tracer;
00079     Support::DynamicStack<Node,Heap> ds;
00081     Space* cur;
00083     unsigned int d;
00085     bool exhausted;
00086   public:
00088     Probe(const Options& opt);
00090     void init(Space* s);
00092     void reset(Space* s, unsigned int d);
00094     Statistics statistics(void) const;
00096     ~Probe(void);
00098     Space* next(const Options& o);
00100     bool done(void) const;
00101   };
00102 
00104   template<class Tracer>
00105   class LDS : public Engine {
00106   protected:
00108     Options opt;
00110     Probe<Tracer> e;
00112     Space* root;
00114     unsigned int d;
00116     bool no_solution;
00117   public:
00119     LDS(Space* s, const Options& o);
00121     virtual Space* next(void);
00123     virtual Statistics statistics(void) const;
00125     void constrain(const Space& b);
00127     void reset(Space* s);
00129     virtual bool stopped(void) const;
00131     virtual ~LDS(void);
00132   };
00133 
00134 }}}
00135 
00136 #include <gecode/search/seq/lds.hpp>
00137 
00138 #endif
00139 
00140 // STATISTICS: search-seq