[#BloombergLP-ball-LoggerManagerConfiguration-UserFieldsPopulatorCallback-09]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::xref:BloombergLP/ball/LoggerManagerConfiguration.adoc[LoggerManagerConfiguration]::UserFieldsPopulatorCallback
:relfileprefix: ../../../
:mrdocs:

`UserFieldsPopulatorCallback` is the type of a user‐supplied callback functor used to populate the user‐defined fields in each log record.

== Synopsis

Declared in `<ball_loggermanagerconfiguration.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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typedef xref:bsl/function-0a.adoc[bsl::function<void(xref:BloombergLP/ball/UserFields.adoc[ball::UserFields]*)>] UserFieldsPopulatorCallback;
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