[cells-devel] A question about the use of vectors in CELLS

[Peder Chr. Nørgaard]

Hello

I am attempting to use a vector as the value in a slot.  It does not
work well in first attempt:

CL-USER> (use-package :cells)
T
CL-USER> (defparameter a1 (make-instance 'model :value (c-in #(1 2 3 4))))
A1
CL-USER> (defparameter a2 (make-instance 'model :value (c? (apply #'+ 
(map 'list #'identity (value a1))))))
A2
CL-USER> (value a2)
10
CL-USER> (setf (elt (value a1) 1) 5)
5
CL-USER> (value a1)
#(1 5 3 4)
CL-USER> (value a2)
10

The VALUE slot of A2, depending on (VALUE A1) is not changing when (VALUE A1) 
is, shall we call it "changed in place".

The cells version is 
from  :pserver:anonymous:anonymous at common-lisp.net:/project/cells/cvsroot.

The Lisp system is SBCL is 1.0.18.0-2.

I would like to enquire whether I am simply doing something trivially wrong, 
or whether this is something that simply cannot be done without a major CELLS 
extension for support of vector values (like, FAMILY, can be viewed as a kind 
of support for list values).  The latter answer may force me to reconsider an 
implementation that I had in mind.

Thank you in advance for any information
-- 
Peder Chr. Nørgaard     e-mail: pcn at pogt.dk
Gefionsvej 19
DK-8230 Åbyhøj          tel: +45 87 44 11 99
Denmark                 mob: +45 30 91 84 31