permlib  0.2.6
Library for permutation computations
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include/permlib/search/partition/set_stabilize_refinement.h
00001 // ---------------------------------------------------------------------------
00002 //
00003 //  This file is part of PermLib.
00004 //
00005 // Copyright (c) 2009-2011 Thomas Rehn <thomas@carmen76.de>
00006 // All rights reserved.
00007 // 
00008 // Redistribution and use in source and binary forms, with or without
00009 // modification, are permitted provided that the following conditions
00010 // are met:
00011 // 1. Redistributions of source code must retain the above copyright
00012 //    notice, this list of conditions and the following disclaimer.
00013 // 2. Redistributions in binary form must reproduce the above copyright
00014 //    notice, this list of conditions and the following disclaimer in the
00015 //    documentation and/or other materials provided with the distribution.
00016 // 3. The name of the author may not be used to endorse or promote products
00017 //    derived from this software without specific prior written permission.
00018 // 
00019 // THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
00020 // IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
00021 // OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
00022 // IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
00023 // INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
00024 // NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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00028 // THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00029 //
00030 // ---------------------------------------------------------------------------
00031 
00032 
00033 #ifndef SETSTABILIZEREFINEMENT_H_
00034 #define SETSTABILIZEREFINEMENT_H_
00035 
00036 #include <permlib/predicate/pointwise_stabilizer_predicate.h>
00037 
00038 #include <permlib/search/partition/partition.h>
00039 #include <permlib/search/partition/refinement.h>
00040 
00041 #include <algorithm>
00042 #include <boost/dynamic_bitset.hpp>
00043 #include <boost/foreach.hpp>
00044 
00045 namespace permlib {
00046 namespace partition {
00047 
00049 template<class PERM>
00050 class SetStabilizeRefinement : public Refinement<PERM> {
00051 public:
00053         template<class InputIterator>
00054         SetStabilizeRefinement(unsigned long n, InputIterator begin, InputIterator end);
00055         
00056         virtual unsigned int apply(Partition& pi) const;
00057         
00058         virtual bool init(Partition& pi);
00059 private:
00060         std::vector<unsigned long> toStab;
00061 };
00062 
00063 template<class PERM>
00064 template<class InputIterator>
00065 SetStabilizeRefinement<PERM>::SetStabilizeRefinement(unsigned long n, InputIterator begin, InputIterator end) 
00066         : Refinement<PERM>(n, Default), toStab(begin, end)
00067 {
00068         std::sort(toStab.begin(), toStab.end());
00069         PERMLIB_DEBUG(print_iterable(toStab.begin(), toStab.end(), 0, "to stab");)
00070 }
00071 
00072 template<class PERM>
00073 unsigned int SetStabilizeRefinement<PERM>::apply(Partition& pi) const {
00074         BOOST_ASSERT( this->initialized() );
00075         unsigned int ret = 0;
00076         BOOST_FOREACH(unsigned int cell, Refinement<PERM>::m_cellPairs) {
00077                 PERMLIB_DEBUG(std::cout << "apply set stab " << cell << std::endl;)
00078                 if (pi.intersect(toStab.begin(), toStab.end(), cell))
00079                         ++ret;
00080         }
00081         return ret;
00082 }
00083 
00084 template<class PERM>
00085 bool SetStabilizeRefinement<PERM>::init(Partition& pi) {
00086         for (unsigned int c = 0; c < pi.cells(); ++c) {
00087                 if (pi.intersect(toStab.begin(), toStab.end(), c))
00088                         Refinement<PERM>::m_cellPairs.push_back(c);
00089         }
00090         if (!Refinement<PERM>::m_cellPairs.empty()) {
00091                 typename Refinement<PERM>::RefinementPtr ref(new SetStabilizeRefinement<PERM>(*this));
00092                 Refinement<PERM>::m_backtrackRefinements.push_back(ref);
00093                 return true;
00094         }
00095         return false;
00096 }
00097 
00098 }
00099 }
00100 
00101 #endif // -- SETSTABILIZEREFINEMENT_H_