[#BloombergLP-bdlb-NullableValueRef-2constructor-0db]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlb.adoc[bdlb]::xref:BloombergLP/bdlb/NullableValueRef.adoc[NullableValueRef]::NullableValueRef
:relfileprefix: ../../../
:mrdocs:

Create a nullable object wrapper that refers to the specified `opt` object. Note that the created wrapper does not own a copy of the underlying nullable value, but instead refers to it, and so the lifetime of `opt` must exceed the lifetime of the created wrapper.

== Synopsis

Declared in `<bdlb_nullablevalueref.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
NullableValueRef(xref:BloombergLP/bdlb/NullableAllocatedValue.adoc[NullableAllocatedValue<TYPE>]& opt);
----


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