TimeConverter.hpp

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/* This file is part of Evoral.
 * Copyright (C) 2009 David Robillard <http://drobilla.net>
 * Copyright (C) 2009 Paul Davis
 *
 * Evoral 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 2 of the License, or (at your option) any later
 * version.
 *
 * Evoral is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef EVORAL_TIME_CONVERTER_HPP
#define EVORAL_TIME_CONVERTER_HPP

#include "evoral/visibility.h"

namespace Evoral {

template<typename A, typename B>
class LIBEVORAL_TEMPLATE_API TimeConverter {
public:
        TimeConverter () : _origin_b (0) {}
        TimeConverter (B ob) : _origin_b (ob) {}
        virtual ~TimeConverter();

        virtual B to(A a) const = 0;

        virtual A from(B b) const = 0;

        B origin_b () const {
                return _origin_b;
        }
        
        void set_origin_b (B o) {
                _origin_b = o;
        }

protected:
        B _origin_b;
};


template<typename A, typename B>
class LIBEVORAL_TEMPLATE_API IdentityConverter : public TimeConverter<A,B> {
  public:
        IdentityConverter() {}
        
        B to(A a)   const;
        A from(B b) const;
};


} // namespace Evoral

#endif // EVORAL_TIME_CONVERTER_HPP