Initializing lists/arrays with structures

From: Andreas Yankopolus (andreas_at_nospam.yank.to)
Date: 02/27/04 

Date: Fri, 27 Feb 2004 10:31:09 -0600

Is there a standard way to initialize a list or array with multiple
instances of a structure? In the following naive example, each element
of the list points to the same instance of element:

[72]> (defstruct element (x 0) (y 0))
ELEMENT
[73]> (setf foo (make-list 3 :initial-element (make-element)))
(#S(ELEMENT :X 0 :Y 0) #S(ELEMENT :X 0 :Y 0) #S(ELEMENT :X 0 :Y 0))
[74]> (setf (element-x (car foo)) 1)
1
[75]> foo
(#S(ELEMENT :X 1 :Y 0) #S(ELEMENT :X 1 :Y 0) #S(ELEMENT :X 1 :Y 0))

I've run into similar problems with make-array, since :initial-contents
want a list.

Thanks,

Andreas

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