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Section: 184.108.40.206 [ostream.manip] Status: WP Submitter: Tim Song Opened: 2021-06-19 Last modified: 2021-10-17
Priority: Not Prioritized
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basic_osyncstream::emit is specified to set badbit if it fails (220.127.116.11 [syncstream.osyncstream.members] p1), but the emit part of the flush_emit manipulator isn't, even though the flush part does set badbit if it fails.More generally, given an osyncstream s, s << flush_emit; should probably have the same behavior as s.flush(); s.emit(). The reference implementation linked in P0753R2 does set badbit on failure, so at least this part appears to be an oversight. As discussed in LWG 3570, basic_osyncstream::emit should probably be an unformatted output function, so the emit part of flush_emit should do so too.
[2021-06-23; Reflector poll]
Set status to Tentatively Ready after six votes in favour during reflector poll.
[2021-10-14 Approved at October 2021 virtual plenary. Status changed: Voting → WP.]
This wording is relative to N4885.
Modify 18.104.22.168 [ostream.manip] as indicated:
template<class charT, class traits> basic_ostream<charT, traits>& flush_emit(basic_ostream<charT, traits>& os);
-12- Effects: Calls os.flush(). Then, if os.rdbuf() is a basic_syncbuf<charT, traits, Allocator>*, called buf for the purpose of exposition, calls buf->emit().