[#BloombergLP-bdlb-NullableValue-2constructor-069]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue]::NullableValue
:relfileprefix: ../../../
:mrdocs:

Create a nullable object having the null value&period; If `TYPE` takes an optional allocator at construction, use the currently installed default allocator to supply memory for subsequent values assigned to this object&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
NullableValue(xref:bsl/nullopt_t.adoc[bsl::nullopt&lowbar;t] const&) noexcept;
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