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Re: Document empty structures
- From: Mark Mitchell <mark at codesourcery dot com>
- To: Richard dot Earnshaw at arm dot com
- Cc: Fergus Henderson <fjh at cs dot mu dot OZ dot AU>, Geoffrey Keating <gkeating at apple dot com>, gcc-patches at gcc dot gnu dot org
- Date: 14 Apr 2003 11:20:18 -0700
- Subject: Re: Document empty structures
- References: <200304141817.h3EIHwK29961@pc960.cambridge.arm.com>
On Mon, 2003-04-14 at 11:17, Richard Earnshaw wrote:
>
> > > I'm pretty sure that the C++ language standard does not say that empty
> > > structures have size 1 -- AFAIK it just says that they have non-zero size
> > > (C++98 section 9, paragraph 3).
> >
> > Correct. The C++ ABI says they have size 1.
>
> Even on a machine where STRUCTURE_SIZE_BOUNDARY != 8? I would have
> thought STRUCTURE_SIZE_BOUNDARY / BITS_PER_UNIT was a more sensible
> definition.
You are even more correct. I forget what the exact calculation is, but
it does indeed take this kind of thing into account.
Thanks,
--
Mark Mitchell
CodeSourcery, LLC
mark at codesourcery dot com