Re: How to convert record?

["Smark" <not.provided@all.com>]

"James Rogers" <jimmaureenrogers@worldnet.att.net> wrote in message
news:3BD8F891.BD8792B1@worldnet.att.net...
> Smark wrote:
> >
> > Well, would you worry about it with a type like this:
> >
> > type Bubba_Type is record
> >     C : Character; -- one byte
> >     I   : Integer; -- 4 bytes
> > end record;
> >
> > Bubba : Bubba_Type;
> >
> > Suppose that Integers must align on 4-byte boundaries.  Then you might
get:
> >
> > Bubba_Type'Size = 40 (= 5 bytes)
> >
> > (Typename'size + System.Storage_Unit - 1) / System.Storage_Unit
> > = ( 40 + 8 - 1)/8 = 47/8 = 6 (bytes)
> >
> > But actually:
> >
> > Bubba'Size = 64 (= 8 bytes)
> >
>
> Of course, you might be able to fix the problem by simply
> reordering the components. The soundest way to do this is via a
> representation clause.
>
> type Bubba_Type is record
>    I : Integer;
>    C : Character;
> end record;
>
> for Bubba_Type use record
>    I : at 0 range 0..31;
>    C : at 4 range 0..7;
> end record;
>

Okay, but reordering is not always an option.  Also, it won't help if you
need an
array of Bubba_Type.

Markku