Update of /project/cells-gtk/cvsroot/public_html In directory common-lisp.net:/tmp/cvs-serv21942/public_html

Modified Files: faq.html Log Message: question 12 added Date: Sun Mar 6 17:48:28 2005 Author: pdenno

Index: public_html/faq.html diff -u public_html/faq.html:1.5 public_html/faq.html:1.6 --- public_html/faq.html:1.5 Sat Mar 5 02:17:01 2005 +++ public_html/faq.html Sun Mar 6 17:48:27 2005 @@ -41,6 +41,7 @@ <li><a href="#q10">How do I do xyz?</a></li> <li><a href="#q11">Q: What does this error mean? : "cellular slot FOO of #&lt;BAR 21B555A4&gt; cannot be setf unless initialized as inputp.</a></li> + <li><a href="#q12">Q: Changing a cell value causes dependencies to fire, but what is considered a change?"</li> </ul>

<p/> @@ -190,14 +191,21 @@ <strong id="q11">Q: What does this error mean? : "cellular slot FOO of #&lt;BAR 21B555A4&gt; cannot be setf unless initialized as inputp."</strong><p/> <strong>A:</strong> This error is signalled because you tried to setf an invariant slot. + 'inputp' refers to c-in which should have been used to initialize the slot. Read the <a href="cgtk-primer.html">cells-gtk primer</a> for more information. +<p/> +<strong id="q12">Q: Changing a cell value causes dependencies to fire, but what is considered a change?"</strong><p/> + <strong>A:</strong> As you are suggesting, setting a slot to an "equivalent" object should not cause its + dependencies to fire again (in order to save substantial useless recalculations). So how is + "equivalence" defined? EQL is used unless overridden by providing a function of two arguments + to :unchanged-if in the slot definition of the defmodel.

<hr/> <address><a href="mailto:peter.denno@nist.gov">Peter Denno</a></address> <!-- Created: Thu Mar 3 18:45:35 EST 2005 --> <!-- hhmts start --> -Last modified: Fri Mar 4 20:15:41 EST 2005 +Last modified: Sat Mar 5 13:11:28 EST 2005 <!-- hhmts end --> </div> </body>