setwise_stabilizer_predicate.h

// ---------------------------------------------------------------------------
//
//  This file is part of PermLib.
//
// Copyright (c) 2009-2011 Thomas Rehn <thomas@carmen76.de>
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// ---------------------------------------------------------------------------
 
 
#ifndef SETWISESTABILIZERPREDICATE_H_
#define SETWISESTABILIZERPREDICATE_H_
 
#include <permlib/predicate/subgroup_predicate.h>
 
#include <boost/foreach.hpp>
 
namespace permlib {

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

        template<class InputIterator>
        SetwiseStabilizerPredicate(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:
        //TODO: perhaps use std::set here?
        std::vector<unsigned long> m_delta;
};
 
//
//     ----       IMPLEMENTATION
//
 
template <class PERM>
template <class InputIterator>
SetwiseStabilizerPredicate<PERM>::SetwiseStabilizerPredicate(InputIterator begin, InputIterator end) 
        : m_delta(begin, end)
{ }
 
template <class PERM>
bool SetwiseStabilizerPredicate<PERM>::operator()(const PERM &p) const {
        BOOST_FOREACH(unsigned long delta_i, m_delta) {
                if (std::find(m_delta.begin(), m_delta.end(), p / delta_i) == m_delta.end())
                        return false;
        }
        return true;
}
 
template <class PERM>
bool SetwiseStabilizerPredicate<PERM>::childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const {
        if (std::find(m_delta.begin(), m_delta.end(), h / beta_i) == m_delta.end())
                return false;
        return true;
}
 
template <class PERM>
unsigned int SetwiseStabilizerPredicate<PERM>::limit() const {
        return m_delta.size();
}
 
}
 
#endif // -- SETWISESTABILIZERPREDICATE_H_