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Subject: [Bug c++/52321] poor diagnostic of invalid cast
Date: Wed, 22 Feb 2012 16:15:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D52321

Manuel L=C3=B3pez-Ib=C3=A1=C3=B1ez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |manu at gcc dot gnu.org

--- Comment #5 from Manuel L=C3=B3pez-Ib=C3=A1=C3=B1ez <manu at gcc dot gnu=
.org> 2012-02-22 15:58:26 UTC ---
(In reply to comment #4)
> Define an enum of reasons with "success" first, flop the sense of the tes=
t so
> that false means coercion was OK (grep to find all calls and put a "!" in=
 front
> of each), and return the reason enum instead of bool. The code that is
> reason-aware saves the enum and builds a good message; the legacy code th=
at is
> not reason-aware treats the enum as a bool and works as before except for=
 the
> inverted sense of the test. Maybe half an hour of work.
>=20
> Plausible?

Plausible in theory, sadly unrealistic in practice. But I would like to be
proven wrong, so give it a try.