[#BloombergLP-bdlar-NullableValueConstRef-isNull]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlar.adoc[bdlar]::xref:BloombergLP/bdlar/NullableValueConstRef.adoc[NullableValueConstRef]::isNull
:relfileprefix: ../../../
:mrdocs:

Return `true` if the referred object contains a null value, and `false` otherwise&period;

== Synopsis

Declared in `&lt;bdlar&lowbar;nullablevalueref&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
isNull() const;
----


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