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        riddles >> cs >> No static variables in union?
        
(Message started by: hoogle on Sep 25^th, 2008, 9:01pm)

Title: No static variables in union?
Post by hoogle on Sep 25^th, 2008, 9:01pm

Why cant we declare static variables in union?

Title: Re: No static variables in union?
Post by GowriKumar on Sep 25^th, 2008, 11:11pm

I'm little confused about the question.

Is the question why this is not allowed:
union foo{
static int il;
};

If yes, the following explanation might help:
static keyword applies for variables/functions, but not the names inside the structures/unions.

union foo {
int i;
int j;
};

static union foo f; /* f is of type union foo and is static */

Regards,
Gowri Kumar

Title: Re: No static variables in union?
Post by towr on Sep 26^th, 2008, 2:20am

A union allows you to address the same element of data in different ways. Now this would clearly pose a problem if it is at the same time static and not static.

Title: Re: No static variables in union?
Post by RajivG on Sep 27^th, 2008, 1:17am

now after reading it i got a problem ::)

normally we do not implement grammar where i feel infeasibility of semantic and syntax implementation.

static variable in structure--------- > i do not see any problem, this is what c++ compiler does when we ask it to give a class with static member.. as essentially class nothing but a structure

now if it is question of Union and i make rule that all members should be static then complier should allow this

can some one put some light ? what problem can be there either semantic of syntactic