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

Constant used to construct disengaged `optional` objects.

== Synopsis

Declared in `<bslstl_optional.h>`

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