[cells-gtk-cvs] CVS update: public_html/faq.html

[Peter Denno]

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 #<BAR 21B555A4> 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 #<BAR 21B555A4> 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 at 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>