HammingWordDistance.h

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/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * Written (W) 2007-2009 Christian Gehl
 * Written (W) 1999-2009 Soeren Sonnenburg
 * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
 */

#ifndef _HAMMINGWORDDISTANCE_H___
#define _HAMMINGWORDDISTANCE_H___

#include <shogun/lib/config.h>

#include <shogun/lib/common.h>
#include <shogun/features/Features.h>
#include <shogun/features/StringFeatures.h>
#include <shogun/distance/StringDistance.h>

namespace shogun
{
    template <class T> class CStringFeatures;

class CHammingWordDistance: public CStringDistance<uint16_t>
{
    public:
        CHammingWordDistance();

        CHammingWordDistance(bool use_sign);

        CHammingWordDistance(CStringFeatures<uint16_t>* l, CStringFeatures<uint16_t>* r, bool use_sign);
        virtual ~CHammingWordDistance();

        virtual bool init(CFeatures* l, CFeatures* r);

        virtual void cleanup();

        virtual EDistanceType get_distance_type() { return D_HAMMINGWORD; }

        virtual const char* get_name() const { return "HammingWordDistance"; }

    protected:
        float64_t compute(int32_t idx_a, int32_t idx_b);

    private:
        void init();

    protected:
        bool use_sign;
};
} // namespace shogun
#endif /* _HAMMINGWORDDISTANCE_H___ */