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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/65113] string::copy violates traits requirements
Date: Wed, 28 Oct 2020 15:33:11 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D65113

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |INVALID
             Status|NEW                         |RESOLVED

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Since C++17 the effects of basic_string::copy are stated in terms of
traits_type::copy, and the precondition is inherited due to the use of
"Effects: Equivalent to ..." wording.

So at least since C++17, if passing the arguments to traits_type::copy is
invalid, then the call to basic_string::copy is invalid.

This was changed by LWG 2777 https://wg21.link/lwg2777

Since that's a library defect, I'm going to consider it correct for us to d=
o it
before C++17 too.=