[Bug c++/92708] [Issue] dynamic_cast unexpected behavior in my code

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92708

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

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

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Akhilesh Kumar from comment #0)
>     delete pb;
>     pa2 = dynamic_cast<A*>(pb);

This is undefined behaviour, the pointer pb is no longer valid.

Also be aware that GCC 8.3 is the oldest release still supported by the GCC
project.