variable declaration in library

[manas0185]

Hi all,

I assume that the variables meant to be used within a library should be declared static so as to restrict there scope and prevent their access in the programs using the library.

Now if my library is being compiled from two c files and am using a global variable in both of them, is there a way to do this without declaring the variable extern? i.e I would like to use the variable in two c files and still have the its scope restricted to the library only. Is there a standard way to do this?


Thank you

[quzah]

Use static functions to access the variable, and don't access it directly. That's pretty much the only way you're going to be able to it without using extern. Hide a static variable inside a function. Use other functions in your library to set or get it.


Quzah.

[manas0185]

but how does that solve the problem? I still would not be able to access the same static function from other file....
could you elaborate your point further, if I am wrong?

[emef]

could you use a header file that holds static getter/setter functions for the variable(s) you need, and include it in the two c files?

[quzah]

/* publicheader.h */
void set( type t );
type get( void );

Make a header to access your library variables. Include it wherever you want to be able to use your library.

/* library.c */
static type getset( type t, int s )
{
    static type x;
    if( s )
        x = t;

    return x;
}

void set( type t )
{
    getset( t, 1 );
}

type get( void )
{
    return getset( 0, 0 );
}

There you go.

Quzah.

[manas0185]

thank you guys....
i think i got the idea