[#BloombergLP-bdlb-NullableValue-2constructor-099]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/NullableValue.adoc[NullableValue]::NullableValue
:relfileprefix: ../../../
:mrdocs:

Create a null nullable object that uses the specified `allocator`.

== Synopsis

Declared in `<bdlb_nullablevalue.h>`

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

== Description

Create a nullable object that has the null value; use the specified `allocator` (e.g., the address of a `bslma::Allocator` object) to supply memory for subsequent values assigned to this object. Note that this constructor will not participate in overload resolution unless `TYPE` is allocator aware.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *nullopt*
| disengaged‐optional tag
| *allocator*
| allocator used to supply memory
|===


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