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/*
Copyright (C) 2011 Paul Davis
Author: Carl Hetherington <cth@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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <map>
#include <set>
namespace ARDOUR {
/** A list of edges for a directed acyclic graph for routes */
class DAGEdges
{
public:
typedef std::map<boost::shared_ptr<Route>, std::set<boost::shared_ptr<Route> > > EdgeMap;
void add (boost::shared_ptr<Route> from, boost::shared_ptr<Route> to);
std::set<boost::shared_ptr<Route> > from (boost::shared_ptr<Route> r) const;
void remove (boost::shared_ptr<Route> from, boost::shared_ptr<Route> to);
bool has_none_to (boost::shared_ptr<Route> to) const;
bool empty () const;
void dump () const;
private:
void insert (EdgeMap& e, boost::shared_ptr<Route> a, boost::shared_ptr<Route> b);
/* Keep a map in both directions to speed lookups */
/** map of edges with from as `first' and to as `second' */
EdgeMap _from_to;
/** map of the same edges with to as `first' and from as `second' */
EdgeMap _to_from;
};
boost::shared_ptr<RouteList> topological_sort (
boost::shared_ptr<RouteList>,
DAGEdges
);
}
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