[#BloombergLP-bslmt-OnceGuard-2constructor]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslmt.adoc[bslmt]::xref:BloombergLP/bslmt/OnceGuard.adoc[OnceGuard]::OnceGuard
:relfileprefix: ../../../
:mrdocs:

Create a guard optionally associated with the specified `once` object.

== Synopsis

Declared in `<bslmt_once.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
OnceGuard(xref:BloombergLP/bslmt/Once.adoc[Once]* once = 0);
----

== Description

Initialize this object to guard the (optionally) specified `once` object. If `once` is not specified, then it must be set later using the `setOnce` method before other methods may be called.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *once*
| optional `Once` object to guard; may be null
|===


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