[#BloombergLP-ball-Logger-UserFieldsPopulatorCallback]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::xref:BloombergLP/ball/Logger.adoc[Logger]::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_loggermanager.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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typedef xref:BloombergLP/ball/LoggerManagerConfiguration/UserFieldsPopulatorCallback-09.adoc[LoggerManagerConfiguration::UserFieldsPopulatorCallback] UserFieldsPopulatorCallback;
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