2009-02-15 21:51:16 -05:00
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/* This file is part of Evoral.
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2011-04-06 11:00:16 -04:00
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* Copyright (C) 2009 David Robillard <http://drobilla.net>
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2009-02-15 21:51:16 -05:00
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* Copyright (C) 2009 Paul Davis
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2009-10-14 12:10:01 -04:00
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*
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2009-02-15 21:51:16 -05:00
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* Evoral is free software; you can redistribute it and/or modify it under the
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* terms of the GNU General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option) any later
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* version.
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*
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* Evoral is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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2009-10-14 12:10:01 -04:00
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*
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2009-02-15 21:51:16 -05:00
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef EVORAL_TIME_CONVERTER_HPP
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#define EVORAL_TIME_CONVERTER_HPP
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namespace Evoral {
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/** A bidirectional converter between two different time units.
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*
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* Think of the conversion method names as if they are written in-between
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* the two template parameters (i.e. "A <name> B").
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*/
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template<typename A, typename B>
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class TimeConverter {
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public:
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TimeConverter () : _origin_b (0) {}
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TimeConverter (B ob) : _origin_b (ob) {}
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virtual ~TimeConverter() {}
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/** Convert A time to B time (A to B) */
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virtual B to(A a) const = 0;
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/** Convert B time to A time (A from B) */
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virtual A from(B b) const = 0;
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B origin_b () const {
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return _origin_b;
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}
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void set_origin_b (B o) {
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_origin_b = o;
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}
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protected:
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B _origin_b;
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};
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2009-02-15 23:39:34 -05:00
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/** A stub TimeConverter that simple statically casts between types. */
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template<typename A, typename B>
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class IdentityConverter : public TimeConverter<A,B> {
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public:
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IdentityConverter() {}
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B to(A a) const { return static_cast<B>(a); }
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A from(B b) const { return static_cast<A>(b); }
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};
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2009-02-15 21:51:16 -05:00
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} // namespace Evoral
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#endif // EVORAL_TIME_CONVERTER_HPP
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