vector_stabilizer_predicate.h

// ---------------------------------------------------------------------------
//
//  This file is part of PermLib.
//
// Copyright (c) 2009-2011 Thomas Rehn <thomas@carmen76.de>
// All rights reserved.
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// modification, are permitted provided that the following conditions
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// ---------------------------------------------------------------------------
 
 
#ifndef VECTORSTABILIZERPREDICATE_H_
#define VECTORSTABILIZERPREDICATE_H_
 
#include <permlib/predicate/subgroup_predicate.h>
 
#include <boost/foreach.hpp>
 
namespace permlib {

template <class PERM>
class VectorStabilizerPredicate : public SubgroupPredicate<PERM> {
public:

        template<class InputIterator>
        VectorStabilizerPredicate(InputIterator begin, InputIterator end);
 
        virtual bool operator()(const PERM &p) const;
        virtual bool childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const;
        virtual unsigned int limit() const;
private:
        std::vector<unsigned int> m_vec;
};
 
//
//     ----       IMPLEMENTATION
//
 
template <class PERM>
template <class InputIterator>
VectorStabilizerPredicate<PERM>::VectorStabilizerPredicate(InputIterator begin, InputIterator end) 
        : m_vec(begin, end)
{ }
 
template <class PERM>
bool VectorStabilizerPredicate<PERM>::operator()(const PERM &p) const {
        for (unsigned int i = 0; i < m_vec.size(); ++i) {
                if (m_vec[p / i] != m_vec[i])
                        return false;
        }
        return true;
}
 
template <class PERM>
bool VectorStabilizerPredicate<PERM>::childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const {
        return (m_vec[h / beta_i] == m_vec[beta_i]);
}
 
template <class PERM>
unsigned int VectorStabilizerPredicate<PERM>::limit() const {
        return m_vec.size();
}
 
}
 
#endif // -- VECTORSTABILIZERPREDICATE_H_