[#BloombergLP-bdlc-IndexClerk-isInUse]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/IndexClerk.adoc[IndexClerk]::isInUse
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:mrdocs:

Return `true` if the specified `index` is currently in use, and `false` otherwise. The behavior is undefined unless `0 <= index` and `index < nextNewIndex()`. Note that this method runs in time proportional to the number of decommissioned indices.

== Synopsis

Declared in `<bdlc_indexclerk.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
isInUse(int index) const;
----


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