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Subject: [Bug libstdc++/105241] std::bitset::reference should have an ADL swap
Date: Tue, 12 Apr 2022 17:46:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105241

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2022-04-12
     Ever confirmed|0                           |1

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Arthur O'Dwyer from comment #0)
> Swapping elements via the std::swap two-step works for `std::vector<bool>=
`;

Not according to the C++ standard it doesn't. That's https://wg21.link/lwg3=
638

> I see no reason it shouldn't also work for `std::bitset<N>`.

I see no requirement in the standard for it to work.

> libc++ and Microsoft STL both support `swap` on `bitset::reference` just
> fine.

That's a non-standard extension.

I think we could add it to libstdc++, but this seems like an LWG issue to m=
e.=