Re: Address of an object

[Stephen Leake <stephen_leake@stephe-leake.org>]

"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:

> Let P be a pointer to X. Then what I need is the address A, which the pool
> P'Storage_Pool returned when X was allocated there. This is the same
> address the pool will receive upon freeing X.
>
> ----------
> The problem behind. What I need is to be able to add some dopes to the
> objects allocated in *my* pool. new T calls to the pool's Allocate, but the
> address it returns gets mangled by the compiler, when converted to the
> pointer P [for example, when T is String]. So, having P I cannot get at my
> dope. Its address should be
>
> A = P.all'Address - Offs
>
> where Offs is known, alas, to the compiler only. The compiler must know
> that, otherwise it couldn't pass that to Deallocate.

So you want access to some compiler-dependent information; clearly the
method will be compiler-dependent, since it isn't defined by the language.

What are you going to do with the "dopes" you add? They won't be
visible from Ada.

-- 
-- Stephe