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Message from discussion Q: how to turn a list of symbols into a function?
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Erik Naggum  
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 More options Oct 30 2000, 8:22 am
Newsgroups: comp.lang.lisp
From: Erik Naggum <e...@naggum.net>
Date: 30 Oct 2000 12:34:08 +0000
Local: Mon, Oct 30 2000 7:34 am
Subject: Re: Q: how to turn a list of symbols into a function?
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* Rainer Joswig <jos...@corporate-world.lisp.de>
| It is simply a notation for lists:
|
| (list '+ pi pi)
|
| is the same as:
|
| `(+ ,pi ,pi)
|
| You can think of it as follows:
|
| In (list '+ pi pi) you have write the list constructing function
| (here LIST) and you have to quote the constants (here the symbol +).
|
| In `(+ ,pi ,pi) you write a list template and everything is constant
| - except in the places after the minus characters - so you are
| unquoting (-> forcing the evaluation at these places). So it is kind
| of opposite from the above.

  Except that the result of the backquote form is to be treated as a
  constant.  The list structure may not be modified as it might be
  shared with other list structures.

  (list ...) constructs a list at run-time.
  `(...) constructs at least parts of the list at read-time.

#:Erik
--
  Does anyone remember where I parked Air Force One?
                                   -- George W. Bush


 
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