[#BloombergLP-balm-DefaultMetricsManager]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balm.adoc[balm]::DefaultMetricsManager
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:mrdocs:

This struct provides a namespace for static functions that create, access, and destroy the default instance of the `MetricsManager`. The expected usage is that the default instance will be created during the initialization of an application (while the task has a single thread) and that it will be destroyed just prior to termination (when there is similarly a single thread).

== Synopsis

Declared in `<balm_defaultmetricsmanager.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct DefaultMetricsManager;
----

== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/balm/DefaultMetricsManager/create-02.adoc[`create`] 
| `create` overloads
| xref:BloombergLP/balm/DefaultMetricsManager/destroy.adoc[`destroy`] 
| Destroy the default instance of `MetricsManager`. After this method returns, `instance()` will return 0. The behavior is undefined if `instance()` is 0 or if this method is called from one thread while another thread is accessing the default metrics manager instance (i.e., this method is _not_ thread‐safe).
| xref:BloombergLP/balm/DefaultMetricsManager/instance.adoc[`instance`] 
| Return the default instance of the `MetricsManager` or 0 if the default instance has not yet been created or has already been destroyed.
| xref:BloombergLP/balm/DefaultMetricsManager/manager.adoc[`manager`] 
| If the optionally specified `manager` is not 0, return `manager`; otherwise return the address of the default metrics manager instance, or 0 if the default metrics manager instance has not yet been created or has already been destroyed. Note that this operation is logically equivalent to `manager ? manager : instance()`.
|===



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