[#BloombergLP-bdlmt-MultiQueueThreadPool-numElements-0e]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlmt.adoc[bdlmt]::xref:BloombergLP/bdlmt/MultiQueueThreadPool.adoc[MultiQueueThreadPool]::numElements
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Return an instantaneous snapshot of the number of elements enqueued in the queue associated with the specified `id` as a non‐negative integer, or ‐1 if `id` does not specify a valid queue.

== Synopsis

Declared in `<bdlmt_multiqueuethreadpool.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
numElements(int id) const;
----


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