return OLD_EDGE, NEW_EDGE, DEL_EDGE, or NO_EDGE degree1 is the number of entries we will check in edge[] if u is using block find in u's table or arra

return OLD_EDGE, NEW_EDGE, DEL_EDGE, or NO_EDGE degree1 is the number of entries we will check in edge[] if u is using block find in u's table or arra

inline size_t getFlag(){return c1;}

inline size_t getFlag(){return c1;}

Returns (uintE) -> std::optional<std::tuple<vertex, vertex-data>>.

strongly discouraged