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DOCS Non-extendable classes

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Closes #6129
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Jonathon Menz 2016-10-13 09:39:46 -07:00
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docs/en/02_Developer_Guides/05_Extending/01_Extensions.md
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@ -10,6 +10,11 @@ or even their own code to make it more reusable.
Extensions are defined as subclasses of either [api:DataExtension] for extending a [api:DataObject] subclass or
the [api:Extension] class for non DataObject subclasses (such as [api:Controllers])
<div class="info" markdown="1">
For performance reasons a few classes are excluded from receiving extensions, including `Object`, `ViewableData`
and `RequestHandler`. You can still apply extensions to descendants of these classes.
</div>
**mysite/code/extensions/MyMemberExtension.php**
:::php