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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/95322] std::list | take | transform, expression does
 not work cbegin() == end()
Date: Tue, 26 May 2020 13:13:50 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95322

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2020-05-26
           Keywords|                            |rejects-valid

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think it's a defect in the standard, the sentinel for transform_view can =
only
be compared to iterators of the same constness:

          friend constexpr bool
          operator=3D=3D(const _Iterator<_Const>& __x, const _Sentinel& __y)
          { return __y.__equal(__x); }

I think it should work though.=