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From: Walter Bright <boost@digitalmars.com>
To: git@vger.kernel.org
Subject: Re: [RFC] Convert builin-mailinfo.c to use The Better String   Library.
Date: Fri, 07 Sep 2007 12:03:24 -0700	[thread overview]
Message-ID: <fbs79k$tac$1@sea.gmane.org> (raw)
In-Reply-To: <20070907094120.GA27754@artemis.corp>

Pierre Habouzit wrote:
>   Well, to me D has two significant drawbacks to be "ready to use". The
> first one is that it doesn't has bit-fields. I often deal with bit-fields
> on structures that have a _lot_ of instances in my program, and the
> bit-field is chosen for code readability _and_ structure size efficiency.
> I know you pretend that using masks manually often generates better
> code. But in my case, speed does not matter _that_ much. I mean it does,
> but not that this micro-level as access to the bit-field is not my
> inner-loop.

I'm surprised this is such an important issue. Others have mentioned it, 
but regard it as a minor thing. Interestingly, the htod program (which 
converts C .h files to D import files) will convert bit fields to inline 
functions, giving equivalent functionality.

>   The other second issue I have, is that there is no way to do:
>   import (C) "foo.h"
> 
>   And this is a big no-go (maybe not for git, but as a general issue)
> because it impedes the use of external libraries with a C interface a
> _lot_. E.g. I'd really like to use it to use some GNU libc extensions,
> but I can't because it has too many dependencies (some async getaddrinfo
> interface, that need me to import all the signal events and so on
> extensions in the libc, with bitfields, wich send us back to the first
> point).

D does come with htod, which converts C .h files to D files. It's not 
possible to do a perfect job (because of macros), but it comes pretty 
darned close. The reason htod gets so close is because it is actually a 
real C compiler front end, not a perl or regex string processing hack.

Because it (may) require a little hand tweaking of the results (again, 
because C headers may include awful things like:
	#define BEGIN {
	#define print printf(
), it's a separate program rather than built-in.


>   I also have a third, but non critical issue, I absolutely don't like
> phobos :)

You're not the only one <g>. But I'll add that access to the standard C 
runtime library *is* a part of D, so at some level it can't be worse 
than C. There's also another runtime library available, Tango, which is 
very popular.

> Though I'm obviously free to chose another library. D has
> definitely many many many real advances over C (like the .init, .size,
> ... and so on fields, known types, and whatever portability nightmare
> the C impose us). In fact I like to use D like I code in C, using
> modules and functions, and very few classes, as few as I can. And even
> (under- ?) using D like this, it is a real pleasure to work with. I'm
> really eager to see gdc be more stable.

There are a lot of people hard at work on D to make it more stable and 
increase the breadth and depth of tools available. I am fully aware that 
there may be non-technical issues to using D in a project like git, like 
availability of other D programmers, tradition, etc., but in this thread 
I'm concerned mainly with technical issues.

P.S. I'm also NOT suggesting that git be converted to D. Translating a 
working, debugged, 80,000 line codebase from one language to another is 
usually a fool's errand.

Thanks for taking the time to post your thoughts.

-----------
Walter Bright
http://www.digitalmars.com  C, C++, D programming language compilers
http://www.astoriaseminar.com  Extraordinary C++

  reply	other threads:[~2007-09-07 19:03 UTC|newest]

Thread overview: 102+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-09-04 20:50 Lukas Sandström
2007-09-04 21:38 ` Alex Riesen
2007-09-04 23:01   ` Pierre Habouzit
2007-09-05 14:54 ` Kristian Høgsberg
2007-09-05 17:29   ` Matthieu Moy
2007-09-06  2:30     ` Miles Bader
2007-09-06  4:48     ` Dmitry Kakurin
2007-09-06  4:59       ` Shawn O. Pearce
2007-09-06  9:12         ` Andreas Ericsson
2007-09-06  9:35           ` Junio C Hamano
2007-09-06 10:21             ` Andreas Ericsson
2007-09-06  9:52           ` David Kastrup
2007-09-06  5:03       ` Miles Bader
2007-09-06 12:08         ` Johannes Schindelin
2007-09-06 17:50       ` Linus Torvalds
2007-09-07  0:21         ` Dmitry Kakurin
2007-09-07  0:38           ` Linus Torvalds
2007-09-07  1:08             ` Dmitry Kakurin
2007-09-07  1:27               ` Linus Torvalds
2007-09-07  3:09                 ` Dmitry Kakurin
2007-09-07  5:48                   ` David Symonds
2007-09-07  6:15                   ` Theodore Tso
2007-09-20 14:06                     ` Steven Burns
2007-09-20 14:56                       ` Andreas Ericsson
2007-09-07  6:31                   ` Andreas Ericsson
2007-09-07 22:17                     ` Dmitry Kakurin
2007-09-07 22:28                       ` David Kastrup
2007-09-08  0:37                         ` Dmitry Kakurin
2007-09-08  6:25                           ` David Kastrup
2007-09-09  0:29                       ` Andreas Ericsson
2007-09-07  6:52                   ` David Kastrup
2007-09-07 10:28                   ` Johannes Schindelin
2007-09-07 10:26                 ` Johannes Schindelin
2007-09-07  6:50               ` David Kastrup
2007-09-07  1:12             ` Linus Torvalds
2007-09-07  1:40               ` alan
2007-09-07  5:09               ` Walter Bright
2007-09-07  7:40                 ` David Kastrup
2007-09-07  8:15                   ` Walter Bright
2007-09-07  8:26                     ` David Kastrup
2007-09-07  9:14                       ` Walter Bright
2007-09-07  9:31                         ` David Kastrup
2007-09-07 20:22                           ` Walter Bright
2007-09-07 20:27                             ` David Kastrup
2007-09-07 23:16                               ` Walter Bright
2007-09-08 23:50                             ` Andreas Ericsson
2007-09-09  0:37                               ` Pierre Habouzit
2007-09-09  1:36                                 ` Andreas Ericsson
2007-09-07 11:36                   ` Wincent Colaiuta
2007-09-07  9:41                 ` Pierre Habouzit
2007-09-07 19:03                   ` Walter Bright [this message]
2007-09-07 19:31                     ` David Kastrup
2007-09-07 20:49                       ` Walter Bright
2007-09-07 19:41                     ` Pierre Habouzit
2007-09-07 19:51                       ` David Kastrup
2007-09-07 19:59                         ` Pierre Habouzit
2007-09-07 20:40                       ` Walter Bright
2007-09-07 20:56                         ` Pierre Habouzit
2007-09-07 22:54                           ` Walter Bright
2007-09-08  0:56               ` John 'Z-Bo' Zabroski
2007-09-08  6:36                 ` David Kastrup
2007-09-19 19:56               ` Steven Burns
2007-09-07  3:06           ` Wincent Colaiuta
2007-09-07  4:06             ` Paul Wankadia
2007-09-07  4:30               ` Nicolas Pitre
2007-09-07  9:19               ` Wincent Colaiuta
2007-09-07  6:25             ` Andreas Ericsson
2007-09-07 10:56               ` Johannes Schindelin
2007-09-07 11:54                 ` Andreas Ericsson
2007-09-07 12:33                   ` Wincent Colaiuta
2007-09-07 12:55                     ` Karl Hasselström
2007-09-07 13:58                     ` Andreas Ericsson
2007-09-07 14:13                       ` Wincent Colaiuta
2007-09-09  0:09                         ` Andreas Ericsson
2007-09-07 16:09                 ` David Kastrup
2007-09-07 11:30               ` Wincent Colaiuta
2007-09-07  8:36             ` Walter Bright
2007-09-07  9:41               ` Andreas Ericsson
2007-09-07 19:23                 ` Walter Bright
2007-09-07 19:40                   ` David Kastrup
2007-09-09  0:25                   ` Andreas Ericsson
2009-09-17 16:23                   ` Bernd Jendrissek
2007-09-07 11:52               ` Wincent Colaiuta
2007-09-07 19:25                 ` Walter Bright
2007-09-22 16:52               ` Steven Burns
2007-09-07  6:47           ` David Kastrup
2007-09-07  7:41             ` Andy Parkins
2007-09-07  8:08               ` David Kastrup
2007-09-07 10:21           ` Johannes Schindelin
2007-09-08  0:32             ` Dmitry Kakurin
2007-09-08  6:24               ` David Kastrup
2007-09-08 23:25               ` Alex Riesen
2007-09-24 13:41         ` figo
2007-09-24 13:57           ` David Kastrup
2007-09-25 19:19             ` Steven Burns
2007-09-25 19:55               ` David Kastrup
2012-05-22 18:30         ` Syed M Raihan
2010-06-10 19:12       ` Ian Molton
2010-06-11 12:23         ` Jakub Narebski
2010-06-11 13:33           ` Dario Rodriguez
2007-09-05 15:27 ` Kristian Høgsberg
2007-09-07 10:47 ` Lukas Sandström

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