https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71044
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> --- Author: redi Date: Wed Dec 12 16:13:49 2018 New Revision: 267057 URL: https://gcc.gnu.org/viewcvs?rev=267057&root=gcc&view=rev Log: Overload std::distance and std::advance for path::iterator Although filesystem::path::iterator is only a bidirectional iterator, the underlying sequence has random access iterators (specifically, raw pointers). This means std::distance and std::advance can be implemented more efficiently than the generic versions which apply ++ and -- repeatedly. PR libstdc++/71044 (partial) * include/bits/fs_path.h (__path_iter_distance, __path_iter_advance): New friend functions to implement std::distance and std::advance more efficiently. (distance, advance): Add overloads for path::iterator. * testsuite/27_io/filesystem/path/itr/components.cc: Test new overload. Modified: trunk/libstdc++-v3/ChangeLog trunk/libstdc++-v3/include/bits/fs_path.h trunk/libstdc++-v3/testsuite/27_io/filesystem/path/itr/traversal.cc
