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

Load into the specified `holder` the address of the specified `category`, its `enabled` status, and the address of the next holder in the linked list of category holders maintained by `category` (prepending `holder` to the linked list of category holders for `category`). The supplied `category` will update the value returned by `holder‐>enabled()` when its enabled state changes, and will reset `holder` (i.e., `holder‐>reset()`) when `category` is destroyed. The behavior is undefined unless `holder` remains valid and _unmodified_ (by the client) for the lifetime of this object.

== Synopsis

Declared in `<balm_metricregistry.h>`

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

== Description

This method should _not_ be used directly by client code. It is an implementation detail of the `balm` metric collection system.


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