[#BloombergLP-ball-CategoryCallbacks]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::CategoryCallbacks
:relfileprefix: ../../
:mrdocs:

This struct provides a namespace for default threshold level related callback function types&period;

== Synopsis

Declared in `&lt;ball&lowbar;categorycallbacks&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct CategoryCallbacks;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/ball/CategoryCallbacks/DefaultThresholdLevels.adoc[`DefaultThresholdLevels`] 
| Callback type that supplies default threshold levels for new categories&period;
| xref:BloombergLP/ball/CategoryCallbacks/NameFilter.adoc[`NameFilter`] 
| Callback type that translates an external category name to an internal registry key&period;
|===



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