Re: Calculate and set Parity

[Stephen Leake <stephen.a.leake.1@gsfc.nasa.gov>]

"Sebastian" <sebastian.madunic@avionics.saab.se> writes:

> Hi,
> 
> I need a subroutine that calculates the parity of a record type with the
> size of 16 bits. Is there some nice way
> to do this? I currently have a solution were I use Unchecked_Conversion to
> convert my variable to an
> array booleans, then I calculate every true etc. Is there some way to do
> this without using Unchecked_Conversion.

Why do you not want to use Unchecked_Conversion?

The calculation of parity inherently involves breaking the abstraction
of the type. Parity is defined in terms of bits; the normal operations
on the type are not.

Unchecked_Conversion is one mechanism Ada provides to let you break
the abstraction of a type. So Unchecked_Conversion _is_ the "nice" way
to do this.

Unchecked_Conversion is a violation of abstraction. That is not
_always_ a bad thing; just _usually_ a bad thing :).

-- 
-- Stephe