Re: pragma Import with 'Address clause

[Stephen Leake <Stephen.A.Leake@nasa.gov>]

Lutz Donnerhacke <lutz@iks-jena.de> writes:

> A common technique to reinterpret data is:
>   a : AT;
>   [...]
>   b : BT;
>   for b'Address use a'Address;
>   pragma Import(Ada, b);
> 
> Is the "pragma Import" really necessary? Of course, the ARM says, that
> elaboration and definition of the imported object is externally defined. So
> they are omitted from the Ada code itself.
> 
> Assume BT is a record without any default expressions. Does this mean, the
> pragma can be omitted from the source code?
> 
> Background: Spark prohibits the use of Pragma Import on objects.

I would hope Spark would prohibit the address clause as well! you are
totally defeating the Ada type system!

-- 
-- Stephe