[#BloombergLP-ball-AttributeContext_RuleEvaluationCache-knownActiveRules]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::xref:BloombergLP/ball/AttributeContext_RuleEvaluationCache.adoc[AttributeContext&lowbar;RuleEvaluationCache]::knownActiveRules
:relfileprefix: ../../../
:mrdocs:

Return a bit mask indicating those rules, from the set of rules provided in the last call to `update`, that are known to be active (as of that last call to `update`)&period; If a bit in the returned value is set to 1, the rule at the corresponding index is active&semi; however, if a bit is set to 0, the corresponding rule is either not active _or_ has not been evaluated&period; Note that `isDataAvailable` should be called to test if this cache contains up&hyphen;to&hyphen;date evaluated rule information for the rules in which they are interested before using the result of this method&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/ball/RuleSet/MaskType.adoc[RuleSet::MaskType]
knownActiveRules() const;
----


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