From: Tim Hunter <cyclists@...>
Date: 2003-09-11T08:30:39+09:00
Subject: Re: Calling fun taking struct and not pointer to struct?

On Thu, 11 Sep 2003 04:24:05 +0900, Nathaniel Talbott wrote:

> Tim Hunter [mailto:Tim.Hunter@sas.com] wrote:
(...)
>> You can't assume that "f" in OUTER2 is the same as "inner.a" in OUTER1.
>> The compiler is free to align structure members, including "inner", any
>> way it wants to, and the alignment requirements for "f" are certainly
>> not the same as for "inner". If the compiler chooses, for example, to
>> always align structures at dword boundaries, then there will be a
>> word-sized gap between 'e' and 'inner.a' in the OUTER1 struct (assuming
>> 32-bit machines) that may not appear between "e" and "f" in the OUTER2
>> struct.
> 
> Hmmm... so the question is, is there any way to determine how the compiler
> aligned things?
> 
> 
> Nathaniel
> 
> <:((><

Well, a starting point would be offsetof().