[#BloombergLP-balm-MetricRegistry-setUserData-0c]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balm.adoc[balm]::xref:BloombergLP/balm/MetricRegistry.adoc[MetricRegistry]::setUserData
:relfileprefix: ../../../
:mrdocs:

Associate the specified `value` with the specified `key` in the description of the specified `metricId`. The behavior is undefined unless `key` was previously returned from `createUserDataKey`. Note that this method allows clients of `balm` to associate (opaque) application‐specific information with a metric.

== Synopsis

Declared in `<balm_metricregistry.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
void
setUserData(
    xref:BloombergLP/balm/MetricId.adoc[MetricId] const& metricId,
    xref:BloombergLP/balm/MetricDescription/UserDataKey.adoc[MetricDescription::UserDataKey] key,
    void const* value);
----


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