From: Dmitry A. Kazakov <mailbox@dmitry-kazakov.de>
Subject: Re: Computer Language Shootout
Date: Mon, 21 Jul 2003 15:39:20 +0200
Date: 2003-07-21T15:39:20+02:00 [thread overview]
Message-ID: <hgqnhv01hokc1eh1anmqfgnv0q32delj48@4ax.com> (raw)
In-Reply-To: qJPSa.110861$N7.15748@sccrnsc03
On Mon, 21 Jul 2003 11:00:38 GMT, "Jeffrey Creem" <jeff@thecreems.com>
wrote:
>"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message
>news:vp9nhv8ju4t5kjrvdtd3sp3qgt59nu31tt@4ax.com...
>
>stuff deleted
>
>> Get_Line (Line.all, Size);
>> Length := Size;
>> while Size = Line'Last loop
>> declare
>> Old_Line : String_Ptr := Line;
>> begin
>> Line := new String'(Old_Line.all & (1..Increment => ' '));
>> Free (Old_Line);
>> end;
>> Get_Line (Line (Length + 1..Line'Last), Size);
>> Length := Length + Size;
>> end loop;
>> end Read_Line;
>>
>> used as:
>>
>> Line : String_Ptr := new String'(1..Increment => ' ');
>> Length : Natural;
>> begin is
>> Read_Line (Line, Length);
>
>Note, this will probably be slower. I see this all the time in code and I
>wish it would go away. There is no need
>to pad the string with blank characters. Yes it makes looking at the string
>in a debugger a little easier but if
>this thing gets called in a loop it is going to be much slower than it
>should due to all the temporary creation and copying.
Agree:
Line := new String (1..Old_Line'Length + Increment);
Line (1..Old_Line'Length) := Old_Line.all;
However, I would expect padding be implemented using sort of memset,
which should be "instant" as compared with "new".
Actually there could be another excuse: a corrupted "commit on access"
memory policy in some OS. Which reminds me speculating upon actions.
(:-))
>If someone really felt they had to put characters in the unused portion of a
>string, I would expect that using something like @
>would be the better choice to help hunt down messed up string index
>values.....But I would rather that the
>unused portion of the string be left alone.
---
Regards,
Dmitry Kazakov
www.dmitry-kazakov.de
next prev parent reply other threads:[~2003-07-21 13:39 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-11 12:05 Computer Language Shootout Craig Carey
2003-07-11 12:18 ` Preben Randhol
2003-07-11 12:50 ` Preben Randhol
2003-07-15 15:15 ` Matthew Heaney
2003-07-15 23:46 ` Robert I. Eachus
2003-07-16 4:37 ` Matthew Heaney
2003-07-16 18:01 ` Robert I. Eachus
2003-07-16 21:35 ` Matthew Heaney
2003-07-17 9:38 ` Preben Randhol
2003-07-17 16:29 ` Wesley Groleau
2003-07-17 17:36 ` Jean-Pierre Rosen
2003-07-17 20:56 ` Preben Randhol
2003-07-17 21:47 ` Robert A Duff
2003-07-18 18:04 ` Robert Spooner
2003-07-18 18:48 ` David C. Hoos
2003-07-19 9:51 ` Preben Randhol
2003-07-21 7:21 ` Jean-Pierre Rosen
2003-07-23 20:34 ` Robert Spooner
2003-07-23 22:22 ` Robert I. Eachus
2003-07-18 21:22 ` Pascal Obry
2003-07-19 19:04 ` Robert A Duff
2003-07-19 21:29 ` Pascal Obry
2003-07-19 23:14 ` Samuel Tardieu
2003-07-20 0:26 ` Robert I. Eachus
2003-07-20 8:44 ` Samuel Tardieu
2003-07-20 13:28 ` Robert I. Eachus
2003-07-20 17:10 ` Samuel Tardieu
2003-07-20 22:43 ` Robert I. Eachus
2003-07-21 8:31 ` Samuel Tardieu
2003-07-21 14:39 ` Hyman Rosen
2003-07-21 15:23 ` Samuel Tardieu
2003-07-21 15:46 ` Hyman Rosen
2003-07-21 16:09 ` tmoran
2003-07-21 17:52 ` Hyman Rosen
2003-07-21 16:14 ` Samuel Tardieu
2003-07-21 17:55 ` Hyman Rosen
2003-07-22 9:07 ` Preben Randhol
2003-07-22 13:21 ` Hyman Rosen
2003-07-23 9:28 ` Preben Randhol
2003-07-23 9:42 ` Vinzent Hoefler
2003-07-23 10:35 ` Preben Randhol
2003-07-23 22:19 ` Randy Brukardt
2003-07-21 8:53 ` Dmitry A. Kazakov
2003-07-21 11:00 ` Jeffrey Creem
2003-07-21 13:39 ` Dmitry A. Kazakov [this message]
2003-07-17 23:32 ` Wesley Groleau
2003-07-18 7:36 ` Dmitry A. Kazakov
2003-07-18 8:05 ` Thomas Wolf
2003-07-18 9:11 ` Jean-Pierre Rosen
2003-07-18 17:31 ` Matthew Heaney
2003-07-17 20:53 ` Preben Randhol
2003-07-17 23:36 ` Wesley Groleau
2003-07-16 7:11 ` Preben Randhol
2003-07-11 21:58 ` Matthew Heaney
2003-07-14 18:46 ` Matthew Heaney
2003-07-14 23:08 ` Matthew Heaney
2003-07-16 3:20 ` Isaac Gouy
2003-07-16 4:42 ` Matthew Heaney
2003-07-16 15:27 ` Isaac Gouy
-- strict thread matches above, loose matches on Subject: below --
2001-11-03 4:15 Using "with function" Mark Lundquist
2001-11-03 5:11 ` Computer Language Shootout Eric Merritt
2001-11-03 6:50 ` tmoran
2001-11-03 7:15 ` Al Christians
2001-11-03 8:52 ` martin.m.dowie
2001-11-03 14:04 ` Ted Dennison
2001-11-03 14:24 ` martin.m.dowie
2001-11-03 14:49 ` Larry Kilgallen
2001-11-03 23:03 ` research@ijs.co.nz
2001-11-04 6:39 ` tmoran
2001-11-04 13:44 ` Larry Kilgallen
2001-11-05 0:59 ` Adrian Hoe
2001-11-05 8:04 ` David Brown
2001-11-06 6:36 ` AG
2001-11-06 8:05 ` tmoran
2001-11-07 8:58 ` AG
2001-11-06 12:07 ` Larry Kilgallen
2001-11-07 6:19 ` Richard Riehle
2001-11-04 15:59 ` Preben Randhol
2001-11-04 20:04 ` martin.m.dowie
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