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From: "Randy Brukardt" <randy@rrsoftware.com>
Subject: Re: Why no Ada.Wide_Directories?
Date: Wed, 19 Oct 2011 16:43:08 -0500
Date: 2011-10-19T16:43:08-05:00	[thread overview]
Message-ID: <j7ng9f$6ob$1@munin.nbi.dk> (raw)
In-Reply-To: a3j4wzrhrj65$.bkkht9t97w84.dlg@40tude.net

"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> wrote in message 
news:a3j4wzrhrj65$.bkkht9t97w84.dlg@40tude.net...
> On Tue, 18 Oct 2011 08:02:31 -0700 (PDT), Adam Beneschan wrote:
>
>> On the other hand, I was confused by your statement
>> "Ada.Character.Handling.To_Upper breaks UTF-8".
>
> When String X contains UTF-8 encoded text (means: Character'Pos = octet
> value), then To_Upper (X) would yield garbage for some texts.

You should have just said:
When String X contains UTF-8 encoded text (means: Character'Pos = octet 
value), then virtually all existing string operations will yield garbage for 
some texts.

The only way to safely use a UTF-8 string is opaquely, which means you can 
store it whole, but any operation on it is performed after decoding it. 
That's of course the best argument for having it be a separate type. The 
problem is that Ada doesn't have any reasonable way to define conversions 
for that type (and having long-winded conversion functions with long winded 
names like "Ada.Strings.Unbounded.To_Unbounded_String" don't count in my 
view). And there is just enough need to treat these things as 
arrays-of-bytes (slicing is needed for storage of variable length UTF-8 
strings in "plain Ada", for one example) that treating them as "opaque" 
isn't ideal.

                                           Randy.







  parent reply	other threads:[~2011-10-19 21:43 UTC|newest]

Thread overview: 100+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-14  6:58 Why no Ada.Wide_Directories? Michael Rohan
2011-10-14  7:39 ` Yannick Duchêne (Hibou57)
2011-10-14  9:07   ` Dmitry A. Kazakov
2011-10-14 12:48     ` Yannick Duchêne (Hibou57)
2011-10-14 12:54     ` Yannick Duchêne (Hibou57)
2011-10-15  1:06 ` ytomino
2011-10-15  6:55   ` Vadim Godunko
2011-10-15 12:34     ` ytomino
2011-10-15  8:38   ` Dmitry A. Kazakov
2011-10-15 13:12     ` Peter C. Chapin
2011-10-15 13:22       ` Ludovic Brenta
2011-10-15 14:47       ` Dmitry A. Kazakov
2011-10-16  5:48         ` Yannick Duchêne (Hibou57)
2011-10-17  0:15         ` Peter C. Chapin
2011-10-17  3:23           ` Yannick Duchêne (Hibou57)
2011-10-17  7:12           ` Simon Wright
2011-10-17  7:59           ` Dmitry A. Kazakov
2011-10-18 10:55             ` Peter C. Chapin
2011-10-18 12:27               ` Dmitry A. Kazakov
2011-10-16  5:51       ` Yannick Duchêne (Hibou57)
2011-10-17 21:41         ` Randy Brukardt
2011-10-18  7:29           ` Dmitry A. Kazakov
2011-10-18 14:06           ` Pascal Obry
2011-10-18 14:08             ` Pascal Obry
2011-10-19 21:32             ` Randy Brukardt
2011-10-17 21:33   ` Randy Brukardt
2011-10-17 23:47     ` ytomino
2011-10-18  1:10       ` Adam Beneschan
2011-10-18  2:32         ` ytomino
2011-10-18  4:46           ` ytomino
2011-10-18  9:32             ` Yannick Duchêne (Hibou57)
2011-10-18 10:00               ` Dmitry A. Kazakov
2011-10-18 10:06                 ` Yannick Duchêne (Hibou57)
2011-10-18 12:01                   ` Dmitry A. Kazakov
2011-10-18 15:02           ` Adam Beneschan
2011-10-18 15:16             ` Dmitry A. Kazakov
2011-10-18 23:42               ` Adam Beneschan
2011-10-19  8:12                 ` Dmitry A. Kazakov
2011-10-19 21:43               ` Randy Brukardt [this message]
2011-10-20  7:37                 ` Dmitry A. Kazakov
2011-10-20 11:04                   ` Yannick Duchêne (Hibou57)
2011-10-20 12:21                     ` Dmitry A. Kazakov
2011-10-20 12:38                       ` Yannick Duchêne (Hibou57)
2011-10-20 14:31                         ` Dmitry A. Kazakov
2011-10-20 15:54                           ` Yannick Duchêne (Hibou57)
2011-10-20 17:35                             ` Dmitry A. Kazakov
2011-10-21 12:53                               ` Yannick Duchêne (Hibou57)
2011-10-21 13:41                                 ` Dmitry A. Kazakov
2011-10-25 19:22                                   ` Randy Brukardt
2011-10-25 19:35                                     ` Dmitry A. Kazakov
2011-10-26 22:41                                       ` Randy Brukardt
2011-10-27  7:43                                         ` Dmitry A. Kazakov
2011-10-27 15:13                                           ` Yannick Duchêne (Hibou57)
2011-10-27 19:39                                             ` Robert A Duff
2011-10-27 21:09                                               ` Yannick Duchêne (Hibou57)
2011-10-28  7:50                                                 ` Dmitry A. Kazakov
2011-10-28  8:45                                                   ` Yannick Duchêne (Hibou57)
2011-10-28 14:59                                                     ` Dmitry A. Kazakov
2011-10-20 17:40                   ` J-P. Rosen
2011-10-20 18:43                     ` Dmitry A. Kazakov
2011-10-21 10:07                     ` Vadim Godunko
2011-10-21 11:25                       ` J-P. Rosen
2011-10-21 12:25                         ` Yannick Duchêne (Hibou57)
2011-10-21 13:13                         ` Dmitry A. Kazakov
2011-10-21 16:03                           ` Yannick Duchêne (Hibou57)
2011-10-21 18:34                             ` Dmitry A. Kazakov
2011-10-21 19:30                               ` Yannick Duchêne (Hibou57)
2011-10-21 20:02                                 ` Dmitry A. Kazakov
2011-10-21 20:36                                   ` Yannick Duchêne (Hibou57)
2011-10-22  7:54                                     ` Dmitry A. Kazakov
2011-10-22 20:28                                       ` Yannick Duchêne (Hibou57)
2011-10-22 22:23                                       ` Yannick Duchêne (Hibou57)
2011-10-23  7:53                                         ` Dmitry A. Kazakov
2011-10-25 19:16                                           ` Randy Brukardt
2011-10-21 18:55                         ` Vadim Godunko
2011-10-21 19:18                           ` J-P. Rosen
2011-10-21 19:41                           ` Yannick Duchêne (Hibou57)
2011-10-18 22:54             ` ytomino
2011-10-18  3:15         ` Yannick Duchêne (Hibou57)
2011-10-18  7:55         ` Dmitry A. Kazakov
2011-10-18  9:41           ` Yannick Duchêne (Hibou57)
2011-10-18 10:25           ` J-P. Rosen
2011-10-18 10:56             ` Yannick Duchêne (Hibou57)
2011-10-18 15:34           ` Adam Beneschan
2011-10-18 17:27             ` J-P. Rosen
2011-10-18 18:33               ` Adam Beneschan
2011-10-18 19:54               ` Yannick Duchêne (Hibou57)
2011-10-18  8:01       ` Dmitry A. Kazakov
2011-10-18  2:59     ` Yannick Duchêne (Hibou57)
2011-10-18  4:07       ` Michael Rohan
2011-10-18  4:54       ` ytomino
2011-10-18  9:54         ` Yannick Duchêne (Hibou57)
2011-10-18 10:52           ` ytomino
2011-10-18 11:02             ` Yannick Duchêne (Hibou57)
2011-10-18 21:18               ` ytomino
2011-10-18 10:10       ` J-P. Rosen
2011-10-22  6:32         ` Michael Rohan
2011-10-22  7:25           ` Yannick Duchêne (Hibou57)
2011-10-25 19:26           ` Randy Brukardt
2011-10-27 17:40 ` anon
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