[#BloombergLP-bsls-BslOnceGuard]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bsls.adoc[bsls]::BslOnceGuard
:relfileprefix: ../../
:mrdocs:

This class provides a guard for managing a `BslOnce` for the purpose of executing a block of code (only) once.

== Synopsis

Declared in `<bsls_bslonce.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
class BslOnceGuard;
----

== Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bsls/BslOnceGuard/2constructor.adoc[`BslOnceGuard`]         [.small]#[constructor]#
| Create a guard to manage a block of code that is executed once.
| xref:BloombergLP/bsls/BslOnceGuard/2destructor.adoc[`~BslOnceGuard`] [.small]#[destructor]#
| Destroy this guard.
| xref:BloombergLP/bsls/BslOnceGuard/enter.adoc[`enter`] 
| Attempt to enter the one‐time block managed by `once`.
| xref:BloombergLP/bsls/BslOnceGuard/leave.adoc[`leave`] 
| Exit the one‐time block of code. The behavior is undefined unless the caller had previously called `enter`, and `enter` had returned `true`.
|===



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