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/* This file is part of Evoral.
* Copyright (C) 2009 Dave 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
namespace Evoral {
/** A bidirectional converter between two different time units.
*
* Think of the conversion method names as if they are written in-between
* the two template parameters (i.e. "A <name> B").
*/
template<typename A, typename B>
class TimeConverter {
public:
virtual ~TimeConverter() {}
/** Convert A time to B time (A to B) */
virtual B to(A a) const = 0;
/** Convert B time to A time (A from B) */
virtual A from(B b) const = 0;
};
/** A stub TimeConverter that simple statically casts between types. */
template<typename A, typename B>
class IdentityConverter : public TimeConverter<A,B> {
B to(A a) const { return static_cast<B>(a); }
A from(B b) const { return static_cast<A>(b); }
};
} // namespace Evoral
#endif // EVORAL_TIME_CONVERTER_HPP
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