From: "Jeffrey R. Carter" <spam.not.jrcarter@acm.not.spam.org>
Subject: Re: How do you bitwise operations in Ada '83 and '95
Date: Wed, 19 Jul 2006 19:43:43 GMT
Date: 2006-07-19T19:43:43+00:00 [thread overview]
Message-ID: <PXvvg.43320$FQ1.10141@attbi_s71> (raw)
In-Reply-To: <1153314304.534739.178430@75g2000cwc.googlegroups.com>
jimmaureenrogers@worldnet.att.net wrote:
>
> Here you will note that the algorithm is the same as the
> Ada version. The bit-wise operations in the nsieve function
> are expressed in the manner you described. According to
> your analysis, if the algorithm is the same and the results
> are the same, the programs are the same. Logic tells me,
> therefore, that accessing individual bits of
> contiguous storage through an array of boolean in Ada is
> a bit-wise operation just as the combination of AND, OR and
> shift operations used in the C program.
The algorithm is the same. The levels of abstraction differ. The Ada
abstraction of a packed array of Boolean is higher level than accessing
individual bits in an unsigned integer but lower level than a set
abstraction. To me, using a set abstraction (that is implemented using
bitwise operations) is not using bitwise operations; perhaps you would
would disagree. Similarly, a compiler probably implements indexing a
packed array of Boolean with shift and mask operations, but using such
an indexing operation is not a bitwise operation.
--
Jeff Carter
"People called Romanes, they go the house?"
Monty Python's Life of Brian
79
next prev parent reply other threads:[~2006-07-19 19:43 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1153244316.853254.291560@m79g2000cwm.googlegroups.com>
2006-07-18 18:45 ` How do you bitwise operations in Ada '83 and '95 Robert A Duff
2006-07-18 18:53 ` jimmaureenrogers
2006-07-18 19:22 ` Jeffrey R. Carter
2006-07-18 21:32 ` jimmaureenrogers
2006-07-19 0:40 ` Jeffrey R. Carter
2006-07-19 3:55 ` jimmaureenrogers
2006-07-19 4:37 ` Jeffrey R. Carter
2006-07-19 13:05 ` jimmaureenrogers
2006-07-19 19:43 ` Jeffrey R. Carter [this message]
[not found] ` <1153313832.389434.144930@s13g2000cwa.googlegroups.com>
2006-07-19 13:55 ` Georg Bauhaus
2006-07-19 14:20 ` Robert A Duff
2006-07-19 19:30 ` Jeffrey R. Carter
2006-07-19 14:41 ` Robert A Duff
2006-07-18 19:21 ` Jeffrey R. Carter
2006-07-19 3:01 ` tmoran
[not found] <9315684D-C216-4EDA-8852-0A6BD4C275B0@amado-alves.info>
2006-07-19 22:30 ` Marius Amado-Alves
2006-07-20 7:40 ` Georg Bauhaus
2006-07-20 9:29 ` Colin Paul Gloster
2006-07-20 12:31 ` Georg Bauhaus
2006-07-20 13:08 ` Colin Paul Gloster
2006-07-20 13:29 ` Marius Amado-Alves
2006-07-20 13:49 ` Georg Bauhaus
2006-07-21 5:23 ` Colin Paul Gloster
2006-07-21 8:00 ` Georg Bauhaus
2006-07-20 9:03 ` Stephen Leake
2006-07-20 9:38 ` Marius Amado-Alves
2006-07-21 9:53 ` Stephen Leake
2006-07-20 11:31 ` Dmitry A. Kazakov
2006-07-20 13:18 ` Marius Amado-Alves
2006-07-21 9:58 ` Stephen Leake
2006-07-21 12:09 ` Dmitry A. Kazakov
2006-07-21 19:03 ` Simon Wright
2006-07-22 8:32 ` Dmitry A. Kazakov
2006-07-22 8:57 ` Simon Wright
2006-07-22 10:52 ` Georg Bauhaus
2006-07-22 13:31 ` Dmitry A. Kazakov
2006-07-20 9:39 Fwd: " Marius Amado-Alves
2006-07-20 17:54 ` tmoran
2006-07-20 18:30 ` Marius Amado-Alves
2006-07-20 19:36 ` tmoran
2006-07-20 22:09 ` Simon Wright
2006-07-21 10:07 ` Stephen Leake
2006-07-21 19:09 ` Simon Wright
2006-07-21 19:45 ` tmoran
2006-07-23 15:59 ` Stephen Leake
2006-07-24 6:08 ` Simon Wright
[not found] <BFF12262-F906-4F9A-B867-D0373609F038@amado-alves.info>
2006-07-20 16:40 ` Marius Amado-Alves
[not found] <CD6E3BB8-52D2-4EED-A790-0184FE56A99A@amado-alves.info>
2006-07-20 20:41 ` Marius Amado-Alves
2006-07-20 23:13 ` Randy Brukardt
2006-07-21 5:38 ` Marius Amado-Alves
2006-07-21 22:09 ` Randy Brukardt
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