https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85671
--- Comment #2 from Liu Hao <lh_mouse at 126 dot com> --- 在 2018/5/7 20:13, redi at gcc dot gnu.org 写道: > https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85671 > > Jonathan Wakely <redi at gcc dot gnu.org> changed: > > What |Removed |Added > ---------------------------------------------------------------------------- > Status|UNCONFIRMED |ASSIGNED > Last reconfirmed| |2018-05-07 > Assignee|unassigned at gcc dot gnu.org |redi at gcc dot > gnu.org > Ever confirmed|0 |1 > > --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- > It would be better to do: > > path __tmp(__lhs); > __tmp /= __rhs; > return __tmp; > > That allows a copy to be elided. > There is no difference in implementation as long as NRVO is in effect.
