--- Comment #8 from manu at gcc dot gnu dot org 2010-02-21 00:17 ---
(In reply to comment #5)
I filed the bug because it seems like this would be at least marginally
useful,
and this way people can find it / read the discussion / whatever. Even if the
end result is WONTFIX, that at
lloyd at randombit dot net [EMAIL PROTECTED] writes:
| I think that's a good definition. My impression is that dynamic_cast is fairly
| expensive,
well, I don't think GCC should be getting into the business of warning
about expensive operations.
-- Gaby
--- Comment #6 from gdr at cs dot tamu dot edu 2007-07-14 13:02 ---
Subject: Re: Request for new warning: useless dynamic_casts
lloyd at randombit dot net [EMAIL PROTECTED] writes:
| I think that's a good definition. My impression is that dynamic_cast is
fairly
| expensive,
well, I
--- Comment #7 from sebor at roguewave dot com 2007-07-15 00:03 ---
In cases when the compiler can figure out that the cast is unnecessary it would
be even better if it would optimize it away than to complain to the user about
not being able to do it.
--
--- Comment #1 from pinskia at gcc dot gnu dot org 2007-06-27 18:14 ---
However it would be nice if the programmer was notified about them,
since even if there is no run-time cost, there is a source-level increase in
complexity which can easily be avoided (and there may well be
--- Comment #2 from bangerth at dealii dot org 2007-06-27 18:53 ---
This strikes me as one of the things that hardly anybody would ever find
useful. I mean, yes it happens, but no, it doesn't hurt, and I haven't
seen such code written in the first place ever. Warnings are for cases
--- Comment #3 from lloyd at randombit dot net 2007-06-27 19:06 ---
I haven't seen such code written in the first place ever.
Neither had I, until I found out it is endemic in a large project at work.
I'd just as soon write a script to find these cases, but figuring out what the
--- Comment #4 from bangerth at dealii dot org 2007-06-27 19:17 ---
(In reply to comment #3)
I think that's a good definition. My impression is that dynamic_cast is fairly
expensive,
But only if the compiler can't know the actual type of an object (which
is exactly the case that you
--- Comment #5 from lloyd at randombit dot net 2007-06-27 19:33 ---
I filed the bug because it seems like this would be at least marginally useful,
and this way people can find it / read the discussion / whatever. Even if the
end result is WONTFIX, that at least lets anyone in the
