Empty structures

Hi,

What is the purpose of using empty structures in C? I know this is only a gcc extension.

Thanks,

Read the gcc extension to discover why they think it's a good idea (perhaps)?

Not much info regarding this extension. http://developer.apple.com/documenta...pty-Structures

I would like to know why someone would use an empty structure, you cannot assign anything...

It may on occasion allow

Code:

---

struct foo {
#ifdef SOMETHING
    int  a;
#endif
#ifdef SOMETHING_ELSE
    int  b;
#endif
};

---

If both conditions were false, then the structure would be empty.
Without the extension, you might struggle to declare a minimally 'empty' struct containing only one char to make the compiler shut up.