DennisOSRM/Project-OSRM — pull request #1064 by alex85k (2014-06-05 17:02:40+00:00)
Title: sort vectors before using std::set_difference

discussed in https://github.com/DennisOSRM/Project-OSRM/pull/998#issuecomment-45238338
The vectors are better to be sorted up to ``name_id_comperator`` before running std::set_difference. Elsewhere we get debug checked iterator assertions on Windows and theretically possible incorrect results.