Static inline functions with static local variables

[Martin Wells]

C89 doesn't have inline but I wanted to use inline in my C89-compliant
program. Someone suggested to me that I use macros to determine
whether inline was supported, and if necessary, simply define it like:

#define inline /* nothing */

, and then define the functions within header files with static
inline:

static inline void Func(void) {}

Something was nagging at me though, some reason why the static-ness of
the function would make it somehow different from plain old inline.
When total it finally occured to me:

static inline void Func(void)
{
static int count = 0;
}

*With* static, each translation unit has its own "count". WithOUT
static, there's only one "count" for the entire program.

Anyway just thought I'd share. . .

Martin

[santosh]

Martin Wells wrote:

C89 doesn't have inline but I wanted to use inline in my C89-compliant
program. Someone suggested to me that I use macros to determine
whether inline was supported, and if necessary, simply define it like:

#define inline /* nothing */

, and then define the functions within header files with static
inline:

static inline void Func(void) {}

Something was nagging at me though, some reason why the static-ness of
the function would make it somehow different from plain old inline.
When total it finally occured to me:

static inline void Func(void)
{
static int count = 0;
}

*With* static, each translation unit has its own "count". WithOUT
static, there's only one "count" for the entire program.

Anyway just thought I'd share. . .

>From n1256.pdf:

6.7.4 (3):

An inline de nition of a function with external linkage shall not
contain a de nition of a
modi able object with static storage duration, and shall not contain a
reference to an
identi er with internal linkage.

[Army1987]

On Sat, 06 Oct 2007 05:05:24 -0700, santosh wrote:

>>From n1256.pdf:

6.7.4 (3):

An inline de nition of a function with external linkage shall not
contain a de nition of a
modi able object with static storage duration, and shall not contain a
reference to an
identi er with internal linkage.

I see that they haven't stopped using the one-character fi
ligature, which what's more got lost in the way of your post from
you to me.
--
Army1987 (Replace "NOSPAM" with "email")
A hamburger is better than nothing.
Nothing is better than eternal happiness.
Therefore, a hamburger is better than eternal happiness.

[Martin Wells]

santosh:

6.7.4 (3):

An inline definition of a function with external linkage shall not
contain a defnition of a
modifable object with static storage duration, and shall not contain a
reference to an
identifer with internal linkage

Ah I see. C++ differs from C in that you can have static-duration
objects within an extern inline function.

Martin

[santosh]

Army1987 wrote:

On Sat, 06 Oct 2007 05:05:24 -0700, santosh wrote:

>>>From n1256.pdf:

6.7.4 (3):

An inline de nition of a function with external linkage shall not
contain a de nition of a
modi able object with static storage duration, and shall not contain
a reference to an
identi er with internal linkage.

I see that they haven't stopped using the one-character fi
ligature, which what's more got lost in the way of your post from
you to me.

Yes. It was displayed fine in my newsreader's editor. Guess I'll have to
manually replace them. It would be nice if WG14 could provide a HTML
version of their drafts, if not all then at least important ones like
n1256.pdf.

[CBFalconer]

Army1987 wrote:

santosh wrote:

>From n1256.pdf:

6.7.4 (3):

An inline de nition of a function with external linkage shall not
contain a de nition of a modi able object with static storage
duration, and shall not contain a reference to an identi er with
internal linkage.

I see that they haven't stopped using the one-character fi
ligature, which what's more got lost in the way of your post from
you to me.

That, to my knowledge, is peculiar to the Foxread PDF displayer.

--
Chuck F (cbfalconer at maineline dot net)
Available for consulting/temporary embedded and systems.
<http://cbfalconer.home.att.net>

--
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