Subject: Re: [PATCH 1/9] Define a structure for object IDs.

From: Johannes Sixt <[email-masked]>
Date: Sun, 04 May 2014 11:21:47 +0200

Am 04.05.2014 08:07, schrieb Michael Haggerty:
> On 05/03/2014 10:12 PM, brian m. carlson wrote:
>> Introduce a structure for object IDs.  This allows us to obtain the benefits
>> of compile-time checking for misuse.  The structure is expected to remain
>> the same size and have the same alignment requirements on all known
>> platforms, compared to the array of unsigned char.
>
> Please clarify whether you plan to rely on all platforms having "the
> same size and alignment constraints" for correctness, or whether that
> observation of the status quo is only meant to reassure us that this
> change won't cause memory to be wasted on padding.

I think that a compiler that has different size and alignment requirements 
for the proposed struct object_id and an unsigned char[20] would, strictly 
speaking, not be a "C" compiler.

-- Hannes