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Jul 3rd, 2007

What is Static functions

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Hi ,

I would thank you for replying for my thread,

I would like to know about static functions C language,what is the use of static functions.

Narendhar Gomathirajan

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narendharg

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Jul 3rd, 2007

Re: What is Static functions

A static function is a function with the static qualifier applied:

C Syntax (Toggle Plain Text)
static void foo ( void )
{
  /* Blah blah */
}
static void foo ( void )
{
  /* Blah blah */
}

What it does is restrict visibility of the function to the translation unit in which it's declared. Functions are implicitly declared as extern by default, which means they're visible across translation units. You can compile the following, but it won't link:

C Syntax (Toggle Plain Text)
/* file1.c */
void foo ( void )
{
}
 
extern void bar ( void )
{
}
 
static void baz ( void )
{
}
/* file1.c */
void foo ( void )
{
}

extern void bar ( void )
{
}

static void baz ( void )
{
}

C Syntax (Toggle Plain Text)
/* file2.c */
void foo ( void );
void bar ( void );
void baz ( void );
 
int main ( void )
{
  foo(); /* OK: foo is extern by default */
  bar(); /* OK: bar is explicitly extern */
  baz(); /* Wrong: baz isn't visible in this translation unit */
}
/* file2.c */
void foo ( void );
void bar ( void );
void baz ( void );

int main ( void )
{
  foo(); /* OK: foo is extern by default */
  bar(); /* OK: bar is explicitly extern */
  baz(); /* Wrong: baz isn't visible in this translation unit */
}

Last edited by Narue; Jul 3rd, 2007 at 4:28 pm.

Narue

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Sep 23rd, 2010

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Re: What is Static functions

Hey i am telling you the basic idea about the static functions.
Static functions are those functions which do not have the access to "this" pointer of the class and it can not be declared as virtual.
Main use of the static function is it can be called without crating object of the class.

mike2205

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Sep 23rd, 2010

Re: What is Static functions

>Static functions are those functions which do not have the access to
>"this" pointer of the class and it can not be declared as virtual.
You need to learn the difference between C and C++ before resurrecting a three year old thread with completely incorrect and unhelpful information.

Narue

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Dec 5th, 2011

Static function

Static function are used to avoid the access of the function from the other module.

By default normal functions can access by any module from the file; to avoid we can use static key word to the function.

Also if you have more than one; same functions name across file and if they were in static we will not get any errors.

-Thanks,
Girish.L.C

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