Re: Bitordering? was Re: Bitmanipulation in Ada

[Simon Wright <simon@pushface.org>]

Jim Rogers <jimmaureenrogers@worldnet.att.net> writes:

> >> When I declare an boolean array with eight elements 1..8 (e.g. to
> >> address a hardware port with eight status bits), how are they
> >> ordered is X(1) the msb or the lsb of the byte?
> > 
> > It is undefined.
> 
> It is undefined in an array. It can be defined in a record.

I think you have to use pragma Pack before the boolean elements are
packed into bits?

I don't have a big-endian machine here, but I'm pretty sure that GNAT
orders a packed boolean array as you would expect from
System.Default_Bit_Order (I used it as a demonstration to the
unbelievers that bit ordering actually matters!)

-- 
Simon Wright                               100% Ada, no bugs.