[#BloombergLP-ball-LoggerManager-registerObserver]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::xref:BloombergLP/ball/LoggerManager.adoc[LoggerManager]::registerObserver
:relfileprefix: ../../../
:mrdocs:

Add the specified `observer` with the specified `observerName` to the registry of observers maintained by this logger manager. Return 0 if `observer` was successfully registered with this logger manager, and a non‐zero value (with no effect) otherwise. Henceforth, all log records published by this logger manager are published to this observer, until `observer` is deregistered. The behavior is undefined if a cyclic reference is created among registered observers. Note that this method will fail if an observer having `observerName` is already registered.

== Synopsis

Declared in `<ball_loggermanager.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
int
registerObserver(
    xref:bsl/shared_ptr-0a.adoc[bsl::shared_ptr<Observer>] const& observer,
    std::string_view const& observerName);
----


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