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Hi Ross<br>
<br>
I can think of only one instance where the second form would be
unavoidable. That is where a unit containing a parent class refers to
one of its subclasses. In other words, the class design is screwed, but
the second form sidesteps the compiler error regarding circular
referencing.<br>
<br>
I have actually seen a situation where a 3rd party library was modified
so that it referenced a class in the main/calling application. Insane! <br>
<br>
If you're looking at something similar, I would suggest you switch to
the first form and fix the crappy design.<br>
<br>
Todd.<br>
<br>
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<p class="MsoNormal"><span
style="font-size: 12pt; color: rgb(31, 73, 125);">Just as a matter of
curiosity really, anyone know if there is any difference in speed for
these 2 operations.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 12pt; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 12pt; color: rgb(31, 73, 125);">if abc is TMyObject
then<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 12pt; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 12pt; color: rgb(31, 73, 125);">and<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 12pt; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 12pt; color: rgb(31, 73, 125);">if abc.Classname =
‘TMyObject’ then<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 12pt; color: rgb(31, 73, 125);"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size: 12pt; color: rgb(31, 73, 125);">?<o:p></o:p></span></p>
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