set_image_predicate.h

// ---------------------------------------------------------------------------
//
//  This file is part of PermLib.
//
// Copyright (c) 2009-2011 Thomas Rehn <thomas@carmen76.de>
// All rights reserved.
// 
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
// 1. Redistributions of source code must retain the above copyright
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// 2. Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
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// 3. The name of the author may not be used to endorse or promote products
//    derived from this software without specific prior written permission.
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// ---------------------------------------------------------------------------
 
 
#ifndef SETIMAGEPREDICATE_H_
#define SETIMAGEPREDICATE_H_
 
#include <permlib/predicate/subgroup_predicate.h>
 
#include <boost/foreach.hpp>
 
namespace permlib {


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

        template<class InputIterator>
        SetImagePredicate(InputIterator deltaBegin, InputIterator deltaEnd, InputIterator gammaBegin, InputIterator gammaEnd);
 
        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;
        std::vector<unsigned long> m_gamma;
};
 
//
//     ----       IMPLEMENTATION
//
 
template <class PERM>
template<class InputIterator>
SetImagePredicate<PERM>::SetImagePredicate(InputIterator deltaBegin, InputIterator deltaEnd, InputIterator gammaBegin, InputIterator gammaEnd)
        : m_delta(deltaBegin, deltaEnd), m_gamma(gammaBegin, gammaEnd)
{
        BOOST_ASSERT(m_delta.size() == m_gamma.size());
}
 
 
template <class PERM>
bool SetImagePredicate<PERM>::operator()(const PERM &p) const {
        BOOST_FOREACH(unsigned long delta_i, m_delta) {
                if (std::find(m_gamma.begin(), m_gamma.end(), p / delta_i) == m_gamma.end())
                        return false;
        }
        return true;
}
 
template <class PERM>
bool SetImagePredicate<PERM>::childRestriction(const PERM &h, unsigned int i, unsigned long beta_i) const {
        if (std::find(m_gamma.begin(), m_gamma.end(), h / beta_i) == m_gamma.end())
                return false;
        return true;
}
 
template <class PERM>
unsigned int SetImagePredicate<PERM>::limit() const {
        return m_delta.size();
}
 
}
 
#endif // -- SETIMAGEPREDICATE_H_