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From: Carsten Dominik <dominik@science.uva.nl>
To: "Tom Breton (Tehom)" <tehom@panix.com>
Cc: emacs-orgmode@gnu.org
Subject: Re: Docs submitted (Was Re: Advice sought on managing decision alternatives.)
Date: Thu, 12 Feb 2009 00:45:20 +0100	[thread overview]
Message-ID: <867425F3-C984-4D41-8BBD-51573C0A9BC9@uva.nl> (raw)
In-Reply-To: <1045.65.96.63.84.1234382543.squirrel@mail.panix.com>


On Feb 11, 2009, at 9:02 PM, Tom Breton (Tehom) wrote:

>>
>> Hi Tom,
>>
>> maybe you can educate me:  I have never understood what the "#" does
>> in code like the one you have here.  You are using it, so maybe you
>> know?
>>
>> - Carsten
>>
>>
>
> Here, it's   #'   that it of interest, not  #  alone.
>
> At the most direct level, it quotes the symbol with `function'  
> instead of
> `quote'.  For example:
>
> (format "%s" ' 'foo)  => "(quote foo)"
> (format "%s" ' #'foo) => "(function foo)"
>
> What it accomplishes:
> * In some contexts, it is needed to get a symbol's function binding
> instead of its value binding.
> * It alerts the byte-compiler that it's seeing a function, so it can
> perform certain optimizations (I don't know offhand exactly what).
> * Stylistically, it alerts the reader.

OK, thanks a lot!

>
>
> It's an imitation of Common Lisp's reader macro  #'  which does sort  
> of
> the same thing.
>
> At the syntax level, it's really a combination of   #   which  
> signals a
> reader macro - though in emacs, it's all hard-coded and inextensible  
> - and
> '  which stands for the function-quote reader macro.
>
> FWIW, what I added to lread.c was an extension of the reader macro
> facility at RMS' request, so you definitely asked the right guy.


:-)  Thanks for the explanations.

>
>
> Tom Breton (Tehom)
>
>

  reply	other threads:[~2009-02-11 23:45 UTC|newest]

Thread overview: 55+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20090101170227.C707734803@mail2.panix.com>
2009-01-01 22:53 ` Feature request and patch - blocked TODO to say BLOCKED Tom Breton (Tehom)
2009-01-09  8:16   ` Carsten Dominik
2009-01-15  2:34     ` Tom Breton (Tehom)
2009-01-17  8:01       ` Carsten Dominik
2009-01-19  3:33     ` Advice sought on managing decision alternatives Tom Breton (Tehom)
2009-01-22 11:15       ` Carsten Dominik
2009-01-31  4:21         ` Tom Breton (Tehom)
2009-01-31  5:41           ` Carsten Dominik
2009-01-31 18:36             ` Tom Breton (Tehom)
2009-02-01 15:54               ` James TD Smith
2009-02-06 13:08           ` Carsten Dominik
2009-02-06 16:16             ` William Henney
2009-02-06 20:07             ` Tom Breton (Tehom)
2009-02-07  0:18               ` Carsten Dominik
2009-02-07 20:46                 ` Tom Breton (Tehom)
2009-02-08 13:06                   ` Carsten Dominik
2009-02-08 20:25                     ` Tom Breton (Tehom)
2009-02-09  6:42                       ` Carsten Dominik
2009-02-10  3:14                         ` Docs submitted (Was Re: Advice sought on managing decision alternatives.) Tom Breton (Tehom)
2009-02-10  7:55                           ` Carsten Dominik
2009-02-24  0:51                             ` org-choose bugfix Tom Breton (Tehom)
2009-02-24  3:05                               ` Manish
2009-04-07  0:13                                 ` Tom Breton (Tehom)
2009-04-08 13:13                                   ` Carsten Dominik
2009-02-24  5:51                               ` Carsten Dominik
2009-02-10  8:46                           ` Docs submitted (Was Re: Advice sought on managing decision alternatives.) Manish
2009-02-10  9:12                             ` Carsten Dominik
2009-02-10 10:26                               ` Manish
2009-02-10 22:48                                 ` Tom Breton (Tehom)
2009-02-12 12:50                                   ` Manish
2009-02-12 20:13                                     ` Tom Breton (Tehom)
2009-02-13  4:23                                       ` Manish
2009-02-12 20:55                                     ` Patch " Tom Breton (Tehom)
2009-02-13  4:38                                       ` Manish
2009-02-11  1:08                                 ` Tom Breton (Tehom)
2009-02-11 10:34                                   ` Carsten Dominik
2009-02-11 21:41                                     ` Tom Breton (Tehom)
2009-02-11 23:38                                       ` Nick Dokos
2009-02-12  4:17                                         ` Tom Breton (Tehom)
2009-02-11 23:44                                       ` Carsten Dominik
2009-02-12  4:27                                         ` Tom Breton (Tehom)
2009-02-12 15:49                                           ` Nick Dokos
2009-02-12 20:32                                             ` Tom Breton (Tehom)
2009-02-12 21:25                                               ` Nick Dokos
2009-02-11 12:29                                   ` Carsten Dominik
2009-02-11 14:58                                     ` Docs submitted Bernt Hansen
2009-02-11 17:33                                       ` Samuel Wales
2009-02-11 15:38                                     ` Docs submitted (Was Re: Advice sought on managing decision alternatives.) Daniel Clemente
2009-02-11 15:41                                       ` Carsten Dominik
2009-02-11 20:02                                     ` Tom Breton (Tehom)
2009-02-11 23:45                                       ` Carsten Dominik [this message]
2009-02-11  1:45                                 ` Slight fix to update-org.sh Tom Breton (Tehom)
2009-02-10 23:19                               ` Docs submitted (Was Re: Advice sought on managing decision alternatives.) Tom Breton (Tehom)
2009-02-11 10:34                                 ` Carsten Dominik
2009-02-10 22:45                             ` Tom Breton (Tehom)

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