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Mention ClassDefOverride #1118

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Mention ClassDefOverride #1118

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Mention ClassDefOverride
ferdymercury Jun 2, 2025
5b6e6b3
mention pathway B for ClassDefOverride use
ferdymercury Jun 4, 2025
e1f3dfe
Update index.md
ferdymercury Jun 4, 2025
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3 changes: 3 additions & 0 deletions manual/io_custom_classes/index.md
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Expand Up @@ -217,6 +217,9 @@ The syntax is:
ClassDef(<ClassName>, <VersionNumber>)
{% endhighlight %}

(In the case of classes inheriting from `TObject`, or from a non-TObject base class declaring itself `ClassDef` or `ClassDefOverride` but not `ClassDefNV`,
then it's better to use `ClassDefOverride` in the child instead of `ClassDef`. Same comment applies to `ClassDefInline` and their override variants.)

The version number identifies this particular version of the class. A version number equal to 0 tells ROOT to not store the class in a root file, but only its base classes (if any).

`ClassDef` injects some methods in the class definition useful for runtime reflection.
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