[Bug c++/58407] [C++11] Should warn about deprecated implicit generation of copy constructor/assignment

jason at gcc dot gnu.org gcc-bugzilla@gcc.gnu.org
Fri May 18 23:43:00 GMT 2018


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=58407

Jason Merrill <jason at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #16 from Jason Merrill <jason at gcc dot gnu.org> ---
(In reply to Jason Merrill from comment #14)
> An interesting subcategory I noticed when I had the warning on by default is
> classes with a virtual destructor, such as the exception hierarchy.  The
> warning calls attention to potential slicing problems, and so I think we
> don't want to add defaulted copy ops; it's good for users to be encouraged
> to e.g. catch by reference.

For the record, I changed my mind about this; a slicing warning should only
apply to copies from an object of unknown dynamic type.

-Wdeprecated-copy added for GCC 9.


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