[#BloombergLP-ball-MultiplexObserver-2constructor]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::xref:BloombergLP/ball/MultiplexObserver.adoc[MultiplexObserver]::MultiplexObserver
:relfileprefix: ../../../
:mrdocs:

Create a multiplexing observer having no registered observers. Optionally specify a `basicAllocator` used to supply memory. If `basicAllocator` is 0, the currently installed default allocator is used.

== Synopsis

Declared in `<ball_multiplexobserver.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
MultiplexObserver(xref:BloombergLP/bslma/Allocator.adoc[bslma::Allocator]* basicAllocator = 0);
----


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