[#BloombergLP-bslmt-ThroughputBenchmark-numThreadsInGroup]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmt.adoc[bslmt]::xref:BloombergLP/bslmt/ThroughputBenchmark.adoc[ThroughputBenchmark]::numThreadsInGroup
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:mrdocs:

Return the number of threads in the specified `threadGroupIndex`. The behavior is undefined unless `0 <= threadGroupIndex < numThreadGroups()`.

== Synopsis

Declared in `<bslmt_throughputbenchmark.h>`

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


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