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

Add the specified `ruleToAdd` to the set of (unique) rules maintained by this object. Return the number of rules added (i.e., 1 on success and 0 if a rule with the same value is already present). The behavior is undefined unless a lock is not held by this thread on the mutex returned by `rulesetMutex`.

== Synopsis

Declared in `<ball_categorymanager.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
addRule(xref:BloombergLP/ball/Rule.adoc[Rule] const& ruleToAdd);
----


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