[#BloombergLP-balm-MetricRegistry-addCategory]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balm.adoc[balm]::xref:BloombergLP/balm/MetricRegistry.adoc[MetricRegistry]::addCategory
:relfileprefix: ../../../
:mrdocs:

Add the specified `category` to this registry, unless it has already been registered. Return the address of the newly‐created non‐modifiable `balm::Category` object on success, and 0 otherwise. The behavior is undefined unless `category` is null‐terminated.

== Synopsis

Declared in `<balm_metricregistry.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/balm/Category.adoc[Category] const*
addCategory(char const* category);
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