Re: pragma convention

["Jeffrey R. Carter" <spam@spam.com>]

Anonymous Coward wrote:

> Is there a way to explicitly define a pointer in ADA to be a raw
> address as it is for C, without the pragma convention?  Is that what
> system.address is?  

No. It's possible for an access value, a convention-C pointer, and a 
System.Address to be 3 different things. However, it's rare for a C pointer and 
a System.Address to be different.

> Someone stated earlier that pragma convention will ensure order is
> preserved for records types passed to pragma convention, but the GNAT
> manual states that pragma Convention has no effect on records:
> 
> http://gcc.gnu.org/onlinedocs/gcc-3.3.5/gnat_rm/Effect-of-Convention-on-Representation.html

What this says about record representations is that GNAT's default 
representation for a record is the same as C's (gcc's, specifically), so for 
GNAT, specifying convention C for a record doesn't change anything because the 
representation is already convention C.

-- 
Jeff Carter
"C's solution to this [variable-sized arrays] has real problems,
and people who are complaining about safety definitely have a point."
Dennis Ritchie
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