Re: Bitmanipulation in Ada

["Björn Persson" <spam-away@nowhere.nil>]

Martin Dowie wrote:

> 2) Address clause to 'overlay' 2 variables at the same address;
> 
> procedure Foo (Y : Unsigned_8) is
>    X : Array_8;
>    for X'Address use Y'Address;
> begin
> ....

Y should probably be declared "in out" here.

> 3) Variant record with a representation clause;
> 
> type Variant (Is_Array : Boolean := False) is
> record
>    case Is_Array is
>       when False =>
>          U : Unsigned_8;
>       when True =>
>          A : Array_8;
>    end case;
> end record;
> for Variant use
> record
>    U at 0 range 0 .. 7;
>    A at 0 range 0 .. 7;
> end record;

If you turn off the discriminant check.

-- 
Björn Persson                              PGP key A88682FD
                    omb jor ers @sv ge.
                    r o.b n.p son eri nu