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Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decis
From: |
Tom Breton (Tehom) |
Subject: |
Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.) |
Date: |
Wed, 11 Feb 2009 15:02:23 -0500 (EST) |
User-agent: |
SquirrelMail/1.4.13 |
>
> 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.
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.
Tom Breton (Tehom)
- Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.), (continued)
- Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.), Carsten Dominik, 2009/02/11
- Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.), Tom Breton (Tehom), 2009/02/11
- Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.), Nick Dokos, 2009/02/12
- Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.), Tom Breton (Tehom), 2009/02/12
- Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.), Nick Dokos, 2009/02/12
- Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.), Carsten Dominik, 2009/02/11
- [Orgmode] Re: Docs submitted, Bernt Hansen, 2009/02/11
- Re: [Orgmode] Re: Docs submitted, Samuel Wales, 2009/02/11
- Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.), Daniel Clemente, 2009/02/11
- Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.), Carsten Dominik, 2009/02/11
- Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.),
Tom Breton (Tehom) <=
- Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.), Carsten Dominik, 2009/02/11
- [Orgmode] Slight fix to update-org.sh, Tom Breton (Tehom), 2009/02/10
- Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.), Tom Breton (Tehom), 2009/02/10
- Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.), Carsten Dominik, 2009/02/11
- Re: [Orgmode] Docs submitted (Was Re: Advice sought on managing decision alternatives.), Tom Breton (Tehom), 2009/02/10