[#BloombergLP-bdlb-NullOptType]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::NullOptType
:relfileprefix: ../../
:mrdocs:

This `class` provides an empty tag type so that `bdlb&colon;&colon;NullableValue` can be explicitly constructed in or assigned to an empty state&period; There are no publicly accessible constructors for this type other than the copy constructor&period; In particular, it is not default constructible, nor list&hyphen;initializable in C&plus;&plus;11&period;

== Synopsis

Declared in `&lt;bdlb&lowbar;nullopt&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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typedef xref:bsl/nullopt_t.adoc[bsl::nullopt&lowbar;t] NullOptType;
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