[#BloombergLP-bdlc-FlatHashTable_GroupControl-inUse]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/FlatHashTable_GroupControl.adoc[FlatHashTable&lowbar;GroupControl]::inUse
:relfileprefix: ../../../
:mrdocs:

Return a bit mask of the `k&lowbar;SIZE` entries that are in use (i&period;e&period;, not empty or erased)&period; The bit at index `i` corresponds to the result for `data&lsqb;i&rsqb;`&period;

== Synopsis

Declared in `&lt;bdlc&lowbar;flathashtable&lowbar;groupcontrol&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
uint32&lowbar;t
inUse() const;
----


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