Inheriting from a built-in class

• To: clim@BBN.COM
• Subject: Inheriting from a built-in class
• From: lgm@iexist.att.com
• Date: Sun, 23 Jan 94 16:34:39 CST

CLIM 2.0-beta on LispWorks 3.2.21-beta-4 and Allegro 4.2.beta2.0

Can a user-defined presentation type inherit from a built-in class
such as STRING?  The CLIM 2.0 spec is not entirely clear on just what
one can and cannot do with built-in classes, and vendors'
implementation behavior and documentation are confusing as well.

(define-presentation-type abc ()
  :inherit-from 'string)

appears to work properly, but

(define-presentation-type def ()
  :inherit-from 'string
  :history t)

works spottily or not at all.


        Lawrence G. Mayka
        AT&T Bell Laboratories
        lgm@iexist.att.com

Standard disclaimer.

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