https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91558
--- Comment #3 from Yichen Yan <yichen.yan at inf dot ethz.ch> --- (In reply to Jonathan Wakely from comment #1) > (In reply to Yichen Yan from comment #0) > > Detail: > > Constexpr for <complex> is in C++14 if I don't misunderstand. But a lot of > > testcases under libstdc++-v3/testsuite/26_numerics/complex/ (e.g. dr844.cc) > > Are you sure? That test doesn't seem to care about constexpr. Yes, check_ret_type require its template argument and argument to be constexpr. > > runs with C++11 and check for constexpr (and pass). > > > > I haven't found some manual or doc explaining that, and wonder if this is a > > bug or some feature? > > The mailing lists are a better place to ask a question like that. > > Adding constexpr to std::complex was done by r166171 many years ago. I think > at the time implementations were allowed to add constexpr as a conforming > extension. I don't see a compelling reason to change it now. I see. Thanks for your reply.
