[load "@misc/setf.l"]
On 1/29/20, pd <eukel...@gmail.com> wrote: > Hello, > > I'd like to know if there's in picolisp the common lisp concept of places, > I mean, is it possible to do this: > > (setq L (1 2 3)) > (set (car L) 'x) > L -> (1 x 3) > (set (cdr L) '(a b)) > L -> (1 a b) > > I'd say it is not places in picolisp, but reference manual says: > > : (set 'L '(a b c) (cdr L) '999) > -> 999 > : L > -> (a 999 c) > > > Which seems similar to places or at least to the use of setf in common > lisp, but what I find strange is in my understanding the set form above > should lead to L -> (a 999) or even (a . 999) because (cdr L) is (b c) and > thus replacing cdr L with 999 leads to (a 999)... where's my error? > For me L should be (a 999 c) only if the set form were: > > : (set 'L '(a b c) (cadr L) '999) > > Also, if not having places, have we got scheme's setcar and setcdr at > least? > > Is there any way of manipulating parts of lists and even objects rather > than using specific functions such as delete, replace and so on ? > > regards > -- UNSUBSCRIBE: mailto:picolisp@software-lab.de?subject=Unsubscribe
