region_sorters.h

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/*
 * Copyright (C) 2011-2013 Paul Davis <paul@linuxaudiosystems.com>
 * Copyright (C) 2011 Carl Hetherington <carl@carlh.net>
 *
 * 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 2 of the License, or
 * (at your option) any later version.
 *
 * This program 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 more 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#include "ardour/region.h"
 
namespace ARDOUR {
 
struct LIBARDOUR_API RegionSortByPosition {
        bool operator() (std::shared_ptr<Region> a, std::shared_ptr<Region> b) {
                return a->position() < b->position();
        }
};
 
struct LIBARDOUR_API RegionSortByLayer {
        bool operator() (std::shared_ptr<Region> a, std::shared_ptr<Region> b) {
                return a->layer() < b->layer();
        }
};
 
/* sort by RegionSortByLayerAndPosition()
 * is equivalent to
 * stable_sort by RegionSortByPosition();
 * stable_sort by RegionSortByLayer();
 */
struct LIBARDOUR_API RegionSortByLayerAndPosition {
        bool operator() (std::shared_ptr<Region> a, std::shared_ptr<Region> b) {
                return
                           (a->layer() < b->layer()  && a->position() < b->position())
                        || (a->layer() == b->layer() && a->position() < b->position());
        }
};
 
} // namespace