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17:55:33
markasoftware
How might I simplify (setf (nth (third node) to-return) (nconc (nth (third node) to-return) (list i))) ?
17:56:10
markasoftware
to-return is a list. I want to append the element i to the end of a certain sub-list of to-return
17:56:55
markasoftware
i can't just use nconc and rely on its mutation, because if (nth (third node) to-return) is null, it obviously can't modify nil.
17:58:07
pjb
markasoftware: you write an appendf modifier macro (or use one from a library, but since it's a one-liner…)
18:12:11
markasoftware
is there any reason i should use (append) instead of (nconc) as the function passed to define-modify-macro?
18:12:51
pfdietz
Safety? A common source of bugs is destructive modification of things that share structure with other things.
18:22:16
antonv
hi, is there a way to run a lisp in rowsell in non-standard readtable case? Like modern Allegro mode.
18:36:46
markasoftware
is the lambda-list for define-modify-macro exclusively for the purpose of limiting the number of arguments?
18:55:28
markasoftware
when a global variable is bound, what exactly is it bound to? Does it have its own name, or is it simply bound to a symbol, and uses the symbol's name?
18:58:16
jackdaniel
markasoftware: when you have the object with slots, some of them may be not bound
18:59:24
jackdaniel
also please see the glossary entry for "unbound variable" here http://www.lispworks.com/documentation/HyperSpec/Body/26_glo_u.htm#unbound_variable
19:00:31
jackdaniel
I've mixed slots and variables here because I was looking for an examples of unbound places
19:04:52
markasoftware
if a variable can be directly bound to a value, why do we need a value cell on symbols?
19:29:35
peey
Is there any syntax in lisp which lets you use a symbol before its definition? e.g. something like (where (set-union s1 s2) (define s1 ....) (define s2 ...))
19:31:21
Bike
(defmacro where (form &rest bindings) `(let (,@bindings) ,form)), then (where (set-union s1 s2) (s1 ...) (s2 ...))