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<br>
Thank you Phil,<br>
<br>
the video is instructive. I will try to put a summary in the
CookBook<br>
as soon as possible. <br>
<br>
bye<br>
Nicola<br>
<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 8/14/21 8:18 PM, Phil B wrote:<br>
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<blockquote type="cite"
cite="mid:CAMJMOehNfaEOgOBpz1wHASy-r=TedUzgPrzHuQ5B9vM+9MiERw@mail.gmail.com">
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<div dir="ltr">
<div dir="ltr">Nicola,</div>
<div><br>
</div>
tl;dr version: If you haven't already seen it, I'd suggest
watching <a href="https://www.youtube.com/watch?v=jXuoFEkg6UA"
moz-do-not-send="true">https://www.youtube.com/watch?v=jXuoFEkg6UA</a>
as it discusses an approach to dealing with method
overrides, adding instvars etc.
<div><br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Sat, Aug 14, 2021 at
1:46 PM Nicola Mingotti via Cuis-dev <<a
href="mailto:cuis-dev@lists.cuis.st"
moz-do-not-send="true">cuis-dev@lists.cuis.st</a>>
wrote:<br>
</div>
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<div> <font size="+1"><font face="monospace">Hi guys,<br>
<br>
I have this question for you. I will describe the
problem with an example.<br>
<br>
I defined a method in my package 'Wunderbar', it is
'readFromString', which<br>
goes into class 'Json class side' and method
category '*Wunderbar-DB'.<br>
<br>
Now, suppose a day in the future I upgrade Cuis and
'readFromString'<br>
is now defined into 'Json class'.</font></font></div>
</blockquote>
<div><br>
</div>
<div>While you didn't specifically ask about it, this is a
good example of why you don't want to apply updates to a
modified image... behavior is often undefined. If you
applied updates on top of your loaded code, the updates
would replace your method which usually isn't what you
want but you would not get any warning indicating it
happened. So if you saved your package after applying
updates to a modified image, your version of the method
would disappear and you likely wouldn't discover it until
you next try to rebuild your image. Or worse, until some
point in the future after that.</div>
<div> </div>
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<div><font size="+1"><font face="monospace"> What will
happen when i try to load 'Wunderbar' package ?<br>
</font></font></div>
</blockquote>
<div><br>
</div>
<div>When you load your package, your method will replace
the system defined one. This is also a good way to have
issues if you're not expecting it: there will often be
code elsewhere in the system depending on this new default
behavior which your method may not provide since you wrote
your method before the new one in the core image existed.
This gets back to the video I recommended at the top of
this response... you not only need to make sure that your
code is the last code applied, but also that any overrides
you are doing are to the version of the method you are
expecting. (i.e. you want ensure both your code works as
well as any other code in the image that depended on the
old method)</div>
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<div><font size="+1"><font face="monospace"> <br>
. Do i get an error for method name overlap ?<br>
</font></font></div>
</blockquote>
<div><br>
</div>
<div>No, there is no overlap.</div>
<div> </div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid
rgb(204,204,204);padding-left:1ex">
<div><font size="+1"><font face="monospace"> . If not, is
there any criteria by which one method should be
called instead of the other<br>
for example: looking at which method category it
belongs to ?<br>
</font></font></div>
</blockquote>
<div><br>
</div>
<div>The method category (i.e. *<package>) effectively
just tells the system which package 'owns' the method.
However, a given method for a given class can only exist
in one place. Whoever defined it last wins.</div>
<div><br>
</div>
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<div><font size="+1"><font face="monospace"> <br>
<br>
bye<br>
<br>
Nicola<br>
</font></font></div>
</blockquote>
<div><br>
</div>
<div>Thanks,</div>
<div>Phil </div>
</div>
</div>
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