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| From | Keith Thompson <kst-u@mib.org> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: local arrays and stack |
| Date | 2015-03-25 12:36 -0700 |
| Organization | None to speak of |
| Message-ID | <87twx8q37f.fsf@kst-u.example.com> (permalink) |
| References | (14 earlier) <meq3lh$tju$1@dont-email.me> <meran6$epa$1@dont-email.me> <merf4a$uam$1@dont-email.me> <merksa$ko5$1@dont-email.me> <meumeh$3pd$1@dont-email.me> |
Bartc <bc@freeuk.com> writes:
> On 24/03/2015 12:22, David Brown wrote:
>> On 24/03/15 11:44, Bartc wrote:
>
>>> Suddenly, heap-allocated VLAs don't seem such a bad option!
>>
>> Yes, they /are/ a bad option unless they are what the /user/ asks for in
>> their source code.
>>
>> Of course, it is generally considered good programming practice to
>> allocate large objects on the heap rather than the stack, but it should
>> be the programmer who decides.
>
> No. The programmer just writes this:
>
> int array[N];
>
> without needing to know where the space is going to come from. That
> might be from the main hardware stack, from the main heap, or some
> combination as I suggest below.
If you're describing what programmers could do in an ideal environment,
I won't disagree.
If you're attempting to describe current reality, you've missed.
Current C implementations (at least the ones I'm familiar with) place
locally declared non-static array objects on the stack, which is
typically limited in size. If you need a very large array object, you
need to define it as static (and live with the fact that its lifetime is
the entire execution of the program), or you need to allocate it with
malloc or equivalent and manage its lifetime yourself.
This *is* "generally considered good programming practice".
[...]
--
Keith Thompson (The_Other_Keith) kst-u@mib.org <http://www.ghoti.net/~kst>
Working, but not speaking, for JetHead Development, Inc.
"We must do something. This is something. Therefore, we must do this."
-- Antony Jay and Jonathan Lynn, "Yes Minister"
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local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-22 01:51 -0700
local arrays and stack asetofsymbols@gmail.com - 2015-03-22 02:23 -0700
Re: local arrays and stack Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-03-22 13:22 -0700
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-23 01:55 -0700
Re: local arrays and stack Xcott Craver <xcottcraver@gmail.com> - 2015-03-22 15:07 -0700
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-23 01:50 -0700
Re: local arrays and stack Robert Wessel <robertwessel2@yahoo.com> - 2015-03-23 04:26 -0500
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-23 06:53 -0700
Re: local arrays and stack Xcott Craver <xcottcraver@gmail.com> - 2015-03-23 07:29 -0700
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-23 08:34 -0700
Re: local arrays and stack Robert Wessel <robertwessel2@yahoo.com> - 2015-03-23 19:57 -0500
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-24 04:01 -0700
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-24 04:37 -0700
Re: local arrays and stack David Brown <david.brown@hesbynett.no> - 2015-03-24 13:04 +0100
Re: local arrays and stack glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-03-24 17:29 +0000
Re: local arrays and stack David Brown <david.brown@hesbynett.no> - 2015-03-24 20:01 +0100
Re: local arrays and stack Keith Thompson <kst-u@mib.org> - 2015-03-23 08:24 -0700
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-23 08:42 -0700
Re: local arrays and stack Bartc <bc@freeuk.com> - 2015-03-23 16:07 +0000
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-23 09:15 -0700
Re: local arrays and stack Keith Thompson <kst-u@mib.org> - 2015-03-23 09:16 -0700
Re: local arrays and stack Bartc <bc@freeuk.com> - 2015-03-23 16:34 +0000
Re: local arrays and stack Xcott Craver <xcottcraver@gmail.com> - 2015-03-23 10:12 -0700
Re: local arrays and stack Bartc <bc@freeuk.com> - 2015-03-23 17:44 +0000
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-23 11:47 -0700
Re: local arrays and stack Xcott Craver <xcottcraver@gmail.com> - 2015-03-23 12:06 -0700
Re: local arrays and stack Bartc <bc@freeuk.com> - 2015-03-23 20:25 +0000
Re: local arrays and stack Xcott Craver <xcottcraver@gmail.com> - 2015-03-23 14:10 -0700
Re: local arrays and stack Bartc <bc@freeuk.com> - 2015-03-23 22:22 +0000
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-23 23:57 -0700
Re: local arrays and stack David Brown <david.brown@hesbynett.no> - 2015-03-24 10:28 +0100
Re: local arrays and stack Bartc <bc@freeuk.com> - 2015-03-24 10:44 +0000
Re: local arrays and stack Martin Shobe <martin.shobe@yahoo.com> - 2015-03-24 06:38 -0500
Re: local arrays and stack Martin Shobe <martin.shobe@yahoo.com> - 2015-03-24 09:57 -0500
Re: local arrays and stack David Brown <david.brown@hesbynett.no> - 2015-03-24 13:22 +0100
Re: local arrays and stack Bartc <bc@freeuk.com> - 2015-03-25 16:07 +0000
Re: local arrays and stack David Brown <david.brown@hesbynett.no> - 2015-03-25 17:42 +0100
Re: local arrays and stack Bartc <bc@freeuk.com> - 2015-03-25 19:06 +0000
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-25 12:26 -0700
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-25 13:20 -0700
Re: local arrays and stack Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-03-25 12:28 -0700
Re: local arrays and stack David Brown <david.brown@hesbynett.no> - 2015-03-25 21:45 +0100
Re: local arrays and stack Keith Thompson <kst-u@mib.org> - 2015-03-25 12:50 -0700
Re: local arrays and stack Bartc <bc@freeuk.com> - 2015-03-25 22:33 +0000
Re: local arrays and stack David Brown <david.brown@hesbynett.no> - 2015-03-25 23:57 +0100
Re: local arrays and stack David Brown <david.brown@hesbynett.no> - 2015-03-25 21:42 +0100
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-25 09:55 -0700
Re: local arrays and stack Keith Thompson <kst-u@mib.org> - 2015-03-25 12:36 -0700
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-25 13:04 -0700
Re: local arrays and stack David Brown <david.brown@hesbynett.no> - 2015-03-25 21:52 +0100
Re: local arrays and stack Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-03-25 15:18 -0700
Re: local arrays and stack David Brown <david.brown@hesbynett.no> - 2015-03-26 00:02 +0100
Re: local arrays and stack Melzzzzz <mel@zzzzz.com> - 2015-03-26 00:47 +0100
Re: local arrays and stack Mel <mel@zzzzz.com> - 2015-03-24 14:58 +0100
Re: local arrays and stack Xcott Craver <xcottcraver@gmail.com> - 2015-03-24 06:58 -0700
Re: local arrays and stack Keith Thompson <kst-u@mib.org> - 2015-03-23 14:34 -0700
Re: local arrays and stack David Brown <david.brown@hesbynett.no> - 2015-03-24 10:16 +0100
Re: local arrays and stack David Brown <david.brown@hesbynett.no> - 2015-03-24 09:55 +0100
Re: local arrays and stack Noob <root@127.0.0.1> - 2015-03-24 10:23 +0100
Re: local arrays and stack Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-24 12:18 -0700
Re: local arrays and stack Keith Thompson <kst-u@mib.org> - 2015-03-24 13:42 -0700
Re: local arrays and stack Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-25 08:47 -0700
Re: local arrays and stack Xcott Craver <xcottcraver@gmail.com> - 2015-03-23 09:32 -0700
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-23 09:57 -0700
Re: local arrays and stack Keith Thompson <kst-u@mib.org> - 2015-03-23 10:37 -0700
Re: local arrays and stack Xcott Craver <xcottcraver@gmail.com> - 2015-03-23 10:49 -0700
Re: local arrays and stack Keith Thompson <kst-u@mib.org> - 2015-03-23 12:48 -0700
Re: local arrays and stack jt@toerring.de (Jens Thoms Toerring) - 2015-03-23 22:29 +0000
Re: local arrays and stack James Kuyper <jameskuyper@verizon.net> - 2015-03-23 19:03 -0400
Re: local arrays and stack jt@toerring.de (Jens Thoms Toerring) - 2015-03-23 23:36 +0000
Re: local arrays and stack fir <profesor.fir@gmail.com> - 2015-03-24 02:17 -0700
Re: local arrays and stack Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-03-23 11:56 -0700
Re: local arrays and stack Robert Wessel <robertwessel2@yahoo.com> - 2015-03-23 20:00 -0500
Re: local arrays and stack David Brown <david.brown@hesbynett.no> - 2015-03-24 10:39 +0100
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