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| From | Ian Collins <ian-news@hotmail.com> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: callback function |
| Date | 2012-10-21 11:32 +1300 |
| Message-ID | <aegn3qFnpi3U17@mid.individual.net> (permalink) |
| References | <k5n77p$e5v$1@speranza.aioe.org> <1o8u781nrpll3im14bf0019tg1523qv226@4ax.com> <k5sl4u$re$1@speranza.aioe.org> <6f84885kvafnr4vmb12o1a4o0tgl9u628p@4ax.com> <k5usd7$s6r$1@speranza.aioe.org> |
On 10/21/12 08:01, Bill Cunningham wrote:
> Barry Schwarz wrote:
>
>> Do you really think the standard should be changed because your
>> limited understanding of the language does not provide you an obvious
>> use of the qualifier?
>
> No not if its that useful. It's because of my limited understanding of C
> that I make this statement. Can you give me a good example of when const is
> good to use. I've never needed it?
Those of us from an embedded background probably use const more than
others. If something is declared cont, the compiler can place it in
read only memory which is typically more plentiful in embedded systems.
So given
const int stuff[] = { 1,2,3,4,5,6,7};
stuff will end up in ROM. Any attempt to modify it will either fail or
cause a crash. So stuff can only be safely passed to a function with a
const qualified parameter.
If you write
void f( int* p );
f( stuff );
and your compiler doesn't at least emit a warning, dump it.
--
Ian Collins
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callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-17 17:16 -0400
Re: callback function John Gordon <gordon@panix.com> - 2012-10-17 21:36 +0000
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-17 17:44 -0400
Re: callback function John Gordon <gordon@panix.com> - 2012-10-17 21:51 +0000
Re: callback function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-10-18 00:11 +0100
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-18 18:37 -0400
Re: callback function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-10-19 01:16 +0100
Re: callback function Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-10-20 06:48 -0700
Re: callback function Ian Collins <ian-news@hotmail.com> - 2012-10-18 10:45 +1300
Re: callback function pete <pfiland@mindspring.com> - 2012-10-19 14:49 -0400
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-19 16:59 -0400
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-19 17:04 -0400
Re: callback function Barry Schwarz <schwarzb@dqel.com> - 2012-10-19 14:14 -0700
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-19 17:31 -0400
Re: callback function Keith Thompson <kst-u@mib.org> - 2012-10-19 14:54 -0700
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-19 18:42 -0400
Re: callback function James Kuyper <jameskuyper@verizon.net> - 2012-10-17 17:47 -0400
Re: callback function tom st denis <tom@iahu.ca> - 2012-10-19 04:44 -0700
Re: callback function James Kuyper <jameskuyper@verizon.net> - 2012-10-19 08:24 -0400
Re: callback function Barry Schwarz <schwarzb@dqel.com> - 2012-10-17 14:39 -0700
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-17 17:50 -0400
Re: callback function Ian Collins <ian-news@hotmail.com> - 2012-10-18 11:00 +1300
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-18 18:20 -0400
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-18 18:24 -0400
Re: callback function Barry Schwarz <schwarzb@dqel.com> - 2012-10-18 22:30 -0700
Re: callback function Ian Collins <ian-news@hotmail.com> - 2012-10-20 11:58 +1300
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-19 19:27 -0400
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-19 19:43 -0400
Re: callback function Barry Schwarz <schwarzb@dqel.com> - 2012-10-19 21:09 -0700
Re: callback function Nick Keighley <nick_keighley_nospam@hotmail.com> - 2012-10-20 06:53 -0700
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-17 19:25 -0400
Re: callback function Ian Collins <ian-news@hotmail.com> - 2012-10-18 13:34 +1300
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-17 20:41 -0400
Re: callback function Ian Collins <ian-news@hotmail.com> - 2012-10-18 14:37 +1300
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-18 18:17 -0400
Re: callback function Ian Collins <ian-news@hotmail.com> - 2012-10-20 11:54 +1300
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-18 18:54 -0400
Re: callback function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-10-19 01:23 +0100
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-18 20:32 -0400
Re: callback function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-10-19 02:43 +0100
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-19 16:56 -0400
Re: callback function Ben Bacarisse <ben.usenet@bsb.me.uk> - 2012-10-19 22:10 +0100
Re: callback function Barry Schwarz <schwarzb@dqel.com> - 2012-10-18 22:30 -0700
Re: callback function Kenneth Brody <kenbrody@spamcop.net> - 2012-10-19 12:37 -0400
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-19 16:52 -0400
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-19 18:44 -0400
Re: callback function Barry Schwarz <schwarzb@dqel.com> - 2012-10-19 21:09 -0700
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-20 15:01 -0400
Re: callback function Keith Thompson <kst-u@mib.org> - 2012-10-20 12:47 -0700
Re: callback function Les Cargill <lcargill99@comcast.com> - 2012-10-20 14:51 -0500
Re: callback function Barry Schwarz <schwarzb@dqel.com> - 2012-10-20 14:39 -0700
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-20 19:06 -0400
Re: callback function Barry Schwarz <schwarzb@dqel.com> - 2012-10-20 22:22 -0700
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-21 14:35 -0400
Re: callback function Kenneth Brody <kenbrody@spamcop.net> - 2012-10-22 10:58 -0400
Re: callback function Bill Cunningham <billcun@suddenlink.net> - 2012-10-24 17:28 -0700
Re: callback function Ian Collins <ian-news@hotmail.com> - 2012-10-21 11:32 +1300
Re: callback function Keith Thompson <kst-u@mib.org> - 2012-10-20 15:51 -0700
Re: callback function Robert Miles <milesrf@Usenet-News.net> - 2012-11-25 22:39 -0600
Re: callback function Keith Thompson <kst-u@mib.org> - 2012-10-17 17:51 -0700
Re: callback function Phil Carmody <thefatphil_demunged@yahoo.co.uk> - 2012-10-18 20:34 +0300
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-18 18:15 -0400
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-18 18:27 -0400
Re: callback function Keith Thompson <kst-u@mib.org> - 2012-10-18 15:47 -0700
Re: callback function "Bill Cunningham" <billcun@suddenlink.net> - 2012-10-18 18:52 -0400
Re: callback function blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2012-10-25 10:01 +0000
Re: callback function Kenneth Brody <kenbrody@spamcop.net> - 2012-10-25 12:44 -0400
Re: callback function blmblm@myrealbox.com <blmblm.myrealbox@gmail.com> - 2012-10-26 12:48 +0000
Re: callback function Robert Miles <milesrf@Usenet-News.net> - 2012-11-25 22:13 -0600
Re: callback function Malcolm McLean <malcolm.mclean5@btinternet.com> - 2012-11-26 03:42 -0800
Re: callback function James Kuyper <jameskuyper@verizon.net> - 2012-11-26 06:59 -0500
Re: callback function Keith Thompson <kst-u@mib.org> - 2012-11-26 23:03 -0800
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