https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71044
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- Created attachment 38461 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38461&action=edit Make directory iterators lazy (In reply to Jonathan Wakely from comment #0) > Directory iterators currently construct a path object on every increment. > This means that incrementing a directory iterator five times then > dereferencing it constructs five paths which are never used (and each one is > eagerly split into components, allocating a container of paths!). > Construction of the path could be postponed so that it's only done on > dereference, so that the five increments are cheap. This has thread-safety > consequences, as the dereference is a const operation and could be performed > concurrently, so the lazy construction of the path needs to be synchronized. As in the attached patch.
