Re: 64-bit integers in Ada

[Victor Giddings <victor.giddings@ois.com>]

David Rasmussen <david.rasmussen@gmx.spam.egg.sausage.and.spam.net> wrote 
in news:3CE3978F.6070704@gmx.spam.egg.sausage.and.spam.net:

> I understand that I can easily use an integer in Ada that has exactly 64 
> bits. But are there any guarantees that such a type would be mapped to 
> native integers on 64-bit machines or to a reasonable double 32-bit 
> implementation on 32-bit machines? At least, are compilers ok at this in 
> real life?
> 
> /David
> 

Try using (or deriving from) Interfaces.Integer_64 or Integer.Unsigned_64. 
Admittedly, this requires 2 steps on the part of the compiler developer. 1) 
actually support the 64-bit integer type. 2) to put it in Interfaces (as 
required by B.2(7)). However, we rely on this in our CORBA product 
implementation and have been making sure that the compiler vendors are 
adding these types when they are supported. 

As of now, I know of only one compiler that supports 64-bit integers and 
doesn't define Interface.Integer_64. That is to be remedied very soon.

-- 
Victor Giddings		mailto:victor.giddings@ois.com
Senior Product Engineer	+1 703 295 6500
Objective Interface Systems	Fax: +1 703 295 6501