permlib  0.2.6
Library for permutation computations
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include/permlib/predicate/setwise_stabilizer_predicate.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.
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00029 //
00030 // ---------------------------------------------------------------------------
00031 
00032 
00033 #ifndef SETWISESTABILIZERPREDICATE_H_
00034 #define SETWISESTABILIZERPREDICATE_H_
00035 
00036 #include <permlib/predicate/subgroup_predicate.h>
00037 
00038 #include <boost/foreach.hpp>
00039 
00040 namespace permlib {
00041 
00043 template <class PERM>
00044 class SetwiseStabilizerPredicate : public SubgroupPredicate<PERM> {
00045 public:
00047 
00051         template<class InputIterator>
00052         SetwiseStabilizerPredicate(InputIterator begin, InputIterator end);
00053 
00054         virtual bool operator()(const PERM &p) const;
00055         virtual bool childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const;
00056         virtual unsigned int limit() const;
00057 private:
00058         //TODO: perhaps use std::set here?
00059         std::vector<unsigned long> m_delta;
00060 };
00061 
00062 //
00063 //     ----       IMPLEMENTATION
00064 //
00065 
00066 template <class PERM>
00067 template <class InputIterator>
00068 SetwiseStabilizerPredicate<PERM>::SetwiseStabilizerPredicate(InputIterator begin, InputIterator end) 
00069         : m_delta(begin, end)
00070 { }
00071 
00072 template <class PERM>
00073 bool SetwiseStabilizerPredicate<PERM>::operator()(const PERM &p) const {
00074         BOOST_FOREACH(unsigned long delta_i, m_delta) {
00075                 if (std::find(m_delta.begin(), m_delta.end(), p / delta_i) == m_delta.end())
00076                         return false;
00077         }
00078         return true;
00079 }
00080 
00081 template <class PERM>
00082 bool SetwiseStabilizerPredicate<PERM>::childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const {
00083         if (std::find(m_delta.begin(), m_delta.end(), h / beta_i) == m_delta.end())
00084                 return false;
00085         return true;
00086 }
00087 
00088 template <class PERM>
00089 unsigned int SetwiseStabilizerPredicate<PERM>::limit() const {
00090         return m_delta.size();
00091 }
00092 
00093 }
00094 
00095 #endif // -- SETWISESTABILIZERPREDICATE_H_