[PATCH -mm 1/5] list.h: add list_singleton

[Peter Zijlstra]

On Mon, 2008-03-17 at 11:04 -0400, Masami Hiramatsu wrote:
> Hi Peter,
> 
> Peter Zijlstra wrote:
> >>> So I guess we can proceed with your list_singleton(), but I'd just like to
> >>> flag this possible confusion, see what people think..
> > 
> > May I kindly ask to please not use the singleton name like this. It does
> > not implement the singleton pattern and will be a great confusion for
> > everybody who expects it to.
> 
> Indeed.
> 
> I have some other candidates.
> - list_single
> - list_has_one
> - list_one
> 
> Could you tell me which or some other name you recommend?

I think list_has_one() or list_is_singular() are good names, they convey
they are a test for a condition by using a form of be.