checked
parameter is true then it filters the edgeset to do not get invalid edges without source or target.
If the checked
template parameter is false then we have to note that the node-iterator cares only the filter on the node-set, and the edge-iterator cares only the filter on the edge-set. This way the edge-map should filter all edges which's source or target is filtered by the node-filter. #include <lemon/ugraph_adaptor.h>