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Return 0 from the topological sort if it failed due to

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feedback.


git-svn-id: svn://localhost/ardour2/branches/3.0@10509 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
Carl Hetherington 2011-11-09 17:43:52 +00:00
parent 9a734cd4b8
commit 0ed06420c2
1 changed files with 5 additions and 2 deletions
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7
libs/ardour/route_dag.cc
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@ -146,7 +146,9 @@ struct RouteRecEnabledComparator
} }
}; };
/** Perform a topological sort of a list of routes using a directed graph representing connections.
* @return Sorted list of routes, or 0 if the graph contains cycles (feedback loops).
*/
boost::shared_ptr<RouteList> boost::shared_ptr<RouteList>
ARDOUR::topological_sort ( ARDOUR::topological_sort (
boost::shared_ptr<RouteList> routes, boost::shared_ptr<RouteList> routes,
@ -189,7 +191,8 @@ ARDOUR::topological_sort (
} }
if (!edges.empty ()) { if (!edges.empty ()) {
cout << "Feedback detected.\n"; /* There are cycles in the graph, so we can't do a topological sort */
return boost::shared_ptr<RouteList> ();
} }
return sorted_routes; return sorted_routes;