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Include guard definining 1

Ganado (6809)
Just wondering what subtle differences could arise, if any, from doing

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#ifndef _GLIBCXX_QUEUE
#define _GLIBCXX_QUEUE 1
...
#endif /* _GLIBCXX_QUEUE */

as opposed to
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#ifndef _GLIBCXX_QUEUE
#define _GLIBCXX_QUEUE
...
#endif /* _GLIBCXX_QUEUE */


Edit: I just figured it out

It's so you can do #if ___AAAA AND #ifdef ___AAAA
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