Re: standard memory allocator alignment issue...

"Eric Sosman" <Eric.Sosman@[EMAIL PROTECTED]
> wrote in message 
news:1210630927.374478@[EMAIL PROTECTED]
> Chris Thomasson wrote:
>> [... determining alignment with a struct and offsetof ...]
>>
>> I have been successfully using the previous method in several 
>> general-purpose memory allocators. However, I wanted to see if there is
a 
>> better way; offsetof works fine. BTW, does anybody know why there is
not 
>> something like ALIGN_MAX in <limits.h> already?
>
>     The Rationale doesn't say why not.  My guess (and it's only
> a guess) is that the Committee didn't want to get too involved
> in specifying exactly how pointers convert to and from integers.
> Without knowledge of which integer bits have what significance,
> you can't make effective use of things like ALIGN_MAX.

Humm, a compiler vendor already has to supply a malloc implementation
which 
returns an address that is aligned on a sufficient boundary for all
integral 
types; right? Well, IMVHO, the standard could mention that a vendor shall 
set the value of ALIGN_MAX to a sufficient boundary analogous to the 
non-NULL return value of malloc which can accompany the alignment of any 
integral type. The rational is that a vendor can likely extract ALIGN_MAX 
from their existing malloc implementation...

Is that total crap?

;^)