[#BloombergLP-ball-MultiplexObserver-numRegisteredObservers]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::xref:BloombergLP/ball/MultiplexObserver.adoc[MultiplexObserver]::numRegisteredObservers
:relfileprefix: ../../../
:mrdocs:

Return the number of observers registered with this multiplexing observer&period;

== Synopsis

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

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


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