🚀 go-pugleaf

There is a discussion of (void *) and pointer casting going on this list.
K&R "Ansi C" book says that conversion: (type *) -> (void *) -> (type *)
is guaranteed to yield the same pointer. This (and the discussion on the
list) suggests that another chain: (void *) -> (type *) -> (void *)
might result in some change of the original pointer. In other words
I would guess that casting a void pointer to a pointer to a type requiring
special memory allignment might involve adjusting it to a proper value.
Is this true? I played with such conversions on Sun Sparcstation
(which surely requires proper allignment of data with sizeof > 1),
using both Sun compiler v. 2.0.1 and Gnu 2.6.3, but never observed
such an automatic adjustment? Odd pointers casted to (e.g.) double
result in Bus Error when referenced. And they show the same odd value
when printed as long values.

So I wonder whether this adjustment is just (nowhere-implemented) possibility 
or some real thing?

regards,

Michal.


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  Michal Szymanski                    Internet: msz@sirius.astrouw.edu.pl
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