permlib  0.2.6
Library for permutation computations
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include/permlib/predicate/vector_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.
00022 // IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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00029 //
00030 // ---------------------------------------------------------------------------
00031 
00032 
00033 #ifndef VECTORSTABILIZERPREDICATE_H_
00034 #define VECTORSTABILIZERPREDICATE_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 VectorStabilizerPredicate : public SubgroupPredicate<PERM> {
00045 public:
00047 
00051         template<class InputIterator>
00052         VectorStabilizerPredicate(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         std::vector<unsigned int> m_vec;
00059 };
00060 
00061 //
00062 //     ----       IMPLEMENTATION
00063 //
00064 
00065 template <class PERM>
00066 template <class InputIterator>
00067 VectorStabilizerPredicate<PERM>::VectorStabilizerPredicate(InputIterator begin, InputIterator end) 
00068         : m_vec(begin, end)
00069 { }
00070 
00071 template <class PERM>
00072 bool VectorStabilizerPredicate<PERM>::operator()(const PERM &p) const {
00073         for (unsigned int i = 0; i < m_vec.size(); ++i) {
00074                 if (m_vec[p / i] != m_vec[i])
00075                         return false;
00076         }
00077         return true;
00078 }
00079 
00080 template <class PERM>
00081 bool VectorStabilizerPredicate<PERM>::childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const {
00082         return (m_vec[h / beta_i] == m_vec[beta_i]);
00083 }
00084 
00085 template <class PERM>
00086 unsigned int VectorStabilizerPredicate<PERM>::limit() const {
00087         return m_vec.size();
00088 }
00089 
00090 }
00091 
00092 #endif // -- VECTORSTABILIZERPREDICATE_H_