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From: tmoran@acm.org
Newsgroups: comp.lang.ada
Subject: Re: Calculate and set Parity
References: <3D8629D3.2040603@acm.org>
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Date: Tue, 17 Sep 2002 01:36:50 GMT
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Date: 2002-09-17T01:36:50+00:00
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> array of Boolean seems like a good way to go. You then simply add up the
> Boolean'Pos of each element and determine if the result is even or odd
> ("rem 2").  You could do an unchecked conversion to a 16-bit modular type
> and use shifts and masks to isolate the individual bits, but using
> Booleans seems simpler.
  If speed is a consideration, and memory is available, convert to an
array of a 16 or an 8 bit type and look up the parity of each element in a
lookup table, then XOR the parities together.