Re: Deference question

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

papand0pul0@yahoo.com (Papandopulo) writes:

> Maybe simple question, but I am just starting with Ada.
> 
> I try to read an array from file using streams:
> 
> declare
>   type X_Value is mod 2**8;
>   type X_Buffer is array (Positive range <>) of X_Value;
>   type X_Buffer_Access is access all X_Buffer;
>   type X_Buffer_Sz is new X_Buffer (1 .. Positive(Q_Bytes));
>   type X_Buffer_Sz_Access is access all X_Buffer_Sz;
>   Buff    : X_Buffer_Sz_Access;
> begin
>   Buff := new X_Buffer_Sz;
>   X_Buffer_Sz'Read (X_Stream, Buff'all);
> end;
> 
> But gnat tells me:
> attribute designator expected
> on the dereference (Buff'all)

You want Buff.all, not Buff'all.

the ' means the following identifier is an "attribute", like 'Read. 

But you want a dereference, which is .all

-- 
-- Stephe