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From: "Jeffrey L. Susanj" <jeffrey.l.susanj@boeing.com>
Subject: Re: How to convert record?
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Date: Thu, 25 Oct 2001 17:12:22 GMT
Xref: archiver1.google.com comp.lang.ada:15191
Date: 2001-10-25T17:12:22+00:00
List-Id: <comp.lang.ada>

There is no guarantee about the actual layout of a record, particularly
between compilers.  I would add a representation clause to fix the layout of
the data.


Jeff S.

"sk" <noname@myob.com> wrote in message
news:mailman.1004013820.8836.comp.lang.ada@ada.eu.org...
> --Anyhow I tried to do Unchecked_Conversion and gnat gave me error
> --message:
> --
> --"unchecked conversion to unconstrained array not allowed".
> --
> --What should I do?
>
> Constrain it
>
>  o o
>   |
>  \_/
>
> declare
>
>     type X_Type is record
>         a : Natural;
>         b : Boolean;
>     end record;
>
>     Record_Character_Size : Natural := (
>          X_Type'Size / Character'Size
>     );
>
>     type Buffer_Type is new String;
>     -- Unconstrained Buffer_Type
>
>     subtype String_For_Record is
>         Buffer_Type (1 .. Record_Character_Size);
>
>     function To_Buffer is new Ada.Unchecked_Conversion (
>         Source => X_Type, String_For_Record
>     );
>
>     X : X_Type;
>
> begin
>     Do_Something (To_Buffer(X));
>
> end;