[#absl-once_flag-2constructor-07]
= xref:absl.adoc[absl]::xref:absl/once_flag.adoc[once&lowbar;flag]::once&lowbar;flag
:relfileprefix: ../../
:mrdocs:

Constructs a `once&lowbar;flag` whose associated function has not yet run&period;

== Synopsis

Declared in `&lt;absl&sol;base&sol;call&lowbar;once&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
constexpr
once&lowbar;flag();
----


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