[#bsl-call_once]
= xref:bsl.adoc[bsl]::call_once
:relfileprefix: ../
:mrdocs:

Alias for `std::call_once` in the `bsl` namespace.

== Synopsis

Declared in `<bsl_mutex.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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using std::call_once;
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