Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.c++ > #9327
| From | Andrey Tarasevich <andreytarasevich@hotmail.com> |
|---|---|
| Newsgroups | comp.lang.c++ |
| Subject | Re: which of these 3 casts would you prefer? |
| Date | 2011-08-25 16:19 -0700 |
| Organization | A noiseless patient Spider |
| Message-ID | <j36l85$bce$1@dont-email.me> (permalink) |
| References | <j36gjq$6ee$1@gregory.bnet.hr> |
On 8/25/2011 2:58 PM, A wrote:
> int Callback(void *pThis)
> {
> TMyClass *pMC = (TMyClass*)pThis; // C style
>
> TMyClass *pMC = static_cast<TMyClass*>(pThis); // C++ style but the
> // same as above
>
> TMyClass *pMC = reinterpret_cast<TMyClass*>(pThis); // Doesn't check if
> // input type was
> // pointer, possibly
> // dangerous
> }
>
> these 3 do essentially the same. is there any preferred one for void* cast
> like this and why? any difference in speed?
Casts from `void *` are handled in C++ by `static_cast`. So, that would
be the one to use in this case. There's no reason to involve a less
restrictive cast (`reinterpret_cast`) when a more restrictive does the
job. That's basically the rule I'd follow: in any situation prefer to
use the most restrictive cast that does the job.
--
Best regards,
Andrey Tarasevich
Back to comp.lang.c++ | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
which of these 3 casts would you prefer? "A" <a@a.a> - 2011-08-25 23:58 +0200
Re: which of these 3 casts would you prefer? Andrey Tarasevich <andreytarasevich@hotmail.com> - 2011-08-25 16:19 -0700
Re: which of these 3 casts would you prefer? Robert Wessel <robertwessel2@yahoo.com> - 2011-08-25 18:59 -0500
Re: which of these 3 casts would you prefer? "Alf P. Steinbach" <alf.p.steinbach:usenet@gmail.com> - 2011-08-26 08:02 +0200
Re: which of these 3 casts would you prefer? "Duga Chernobyl" <duga_c3@gmx.com> - 2011-08-26 10:05 +0200
Re: which of these 3 casts would you prefer? "A" <a@a.a> - 2011-08-26 14:40 +0200
Re: which of these 3 casts would you prefer? Leigh Johnston <leigh@i42.co.uk> - 2011-08-26 13:59 +0100
Re: which of these 3 casts would you prefer? "Duga Chernobyl" <duga_c3@gmx.com> - 2011-08-26 15:19 +0200
Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-26 21:27 +0000
Re: which of these 3 casts would you prefer? "Alf P. Steinbach" <alf.p.steinbach:usenet@gmail.com> - 2011-08-27 01:28 +0200
Re: which of these 3 casts would you prefer? "Duga Chernobyl" <duga_c3@gmx.com> - 2011-08-27 10:23 +0200
Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-27 12:10 +0000
Re: which of these 3 casts would you prefer? RaZiel <raziel_206_@hotmail.com> - 2011-08-27 21:55 +0200
Re: which of these 3 casts would you prefer? Miles Bader <miles@gnu.org> - 2011-09-01 08:03 +0900
Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-31 23:11 -0700
Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-09-01 19:34 +0000
Re: which of these 3 casts would you prefer? Joshua Maurice <joshuamaurice@gmail.com> - 2011-09-01 15:37 -0700
Re: which of these 3 casts would you prefer? gwowen <gwowen@gmail.com> - 2011-09-02 00:30 -0700
Re: which of these 3 casts would you prefer? Miles Bader <miles@gnu.org> - 2011-09-03 18:26 +0900
Re: which of these 3 casts would you prefer? Edek <edek.pienkowski@gmail.com> - 2011-08-26 15:29 +0200
Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-27 09:35 -0700
Re: which of these 3 casts would you prefer? Juha Nieminen <nospam@thanks.invalid> - 2011-08-27 18:38 +0000
Re: which of these 3 casts would you prefer? Noah Roberts <roberts.noah@gmail.com> - 2011-08-27 12:32 -0700
Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-27 14:51 -0700
Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-29 14:10 +0000
Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-30 07:23 -0700
Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-29 11:32 +0000
Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-27 14:37 -0700
Re: which of these 3 casts would you prefer? Ian Collins <ian-news@hotmail.com> - 2011-08-28 10:06 +1200
Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-27 15:27 -0700
Re: which of these 3 casts would you prefer? Ian Collins <ian-news@hotmail.com> - 2011-08-28 10:47 +1200
Re: which of these 3 casts would you prefer? Noah Roberts <roberts.noah@gmail.com> - 2011-08-27 15:42 -0700
Re: which of these 3 casts would you prefer? Nobody <nobody@nowhere.com> - 2011-08-28 04:15 +0100
Re: which of these 3 casts would you prefer? Noah Roberts <roberts.noah@gmail.com> - 2011-08-27 15:52 -0700
Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-28 01:54 -0700
Re: which of these 3 casts would you prefer? Keith H Duggar <duggar@alum.mit.edu> - 2011-09-04 19:16 -0700
Re: which of these 3 casts would you prefer? Juha Nieminen <nospam@thanks.invalid> - 2011-08-29 18:16 +0000
Re: which of these 3 casts would you prefer? Noah Roberts <roberts.noah@gmail.com> - 2011-08-29 16:35 -0700
Re: which of these 3 casts would you prefer? Nobody <nobody@nowhere.com> - 2011-08-30 04:13 +0100
Re: which of these 3 casts would you prefer? Juha Nieminen <nospam@thanks.invalid> - 2011-08-30 06:03 +0000
Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-30 07:12 -0700
Re: which of these 3 casts would you prefer? Juha Nieminen <nospam@thanks.invalid> - 2011-08-31 06:16 +0000
Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-09-01 03:05 -0700
Re: which of these 3 casts would you prefer? Juha Nieminen <nospam@thanks.invalid> - 2011-09-01 07:00 +0000
Re: which of these 3 casts would you prefer? BGB <cr88192@hotmail.com> - 2011-08-31 13:21 -0700
Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-28 19:30 +0000
Re: which of these 3 casts would you prefer? Noah Roberts <roberts.noah@gmail.com> - 2011-08-27 12:19 -0700
Re: which of these 3 casts would you prefer? Dombo <dombo@disposable.invalid> - 2011-08-28 12:08 +0200
Re: which of these 3 casts would you prefer? Jorgen Grahn <grahn+nntp@snipabacken.se> - 2011-08-28 19:44 +0000
Re: which of these 3 casts would you prefer? Noah Roberts <roberts.noah@gmail.com> - 2011-08-28 13:41 -0700
Re: which of these 3 casts would you prefer? Anand Hariharan <mailto.anand.hariharan@gmail.com> - 2011-08-26 07:30 -0700
csiph-web