* const qualifiers on function returns type
@ 2005-04-09 1:09 Benoit Boissinot
0 siblings, 0 replies; 2+ messages in thread
From: Benoit Boissinot @ 2005-04-09 1:09 UTC (permalink / raw)
To: linux-kernel
Hi,
there are some function who are declared this way:
include/linux/cpuset.h:21
extern const cpumask_t cpuset_cpus_allowed(const struct task_struct *p);
I was wondering what means const for a function returns type.
K&R doesn't say anything about this and gcc-4 warns (warning: type
qualifiers ignored on function return type)
If it is a mistake, there are a few functions who should be modified.
Regards,
Benoit
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: const qualifiers on function returns type
[not found] <3RcNK-4PC-1@gated-at.bofh.it>
@ 2005-04-09 2:42 ` Bodo Eggert
0 siblings, 0 replies; 2+ messages in thread
From: Bodo Eggert @ 2005-04-09 2:42 UTC (permalink / raw)
To: Benoit Boissinot, linux-kernel
Benoit Boissinot <bboissin@gmail.com> wrote:
> extern const cpumask_t cpuset_cpus_allowed(const struct task_struct *p);
>
> I was wondering what means const for a function returns type.
> K&R doesn't say anything about this and gcc-4 warns (warning: type
> qualifiers ignored on function return type)
It used to be a hint that the function has no side effect nor depends on
any variable besides the parameters. Calls to those functions may be cached
or omitted.
--
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Paradigm pro-activator (a whole pack)
(you mean beer?)
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2005-04-09 1:09 const qualifiers on function returns type Benoit Boissinot
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2005-04-09 2:42 ` Bodo Eggert
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