[#BloombergLP-bdlar-bdlat_nullableValueIsNull-04]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlar.adoc[bdlar]::bdlat_nullableValueIsNull
:relfileprefix: ../../
:mrdocs:

Return `true` if the specified `ref` contains a null value, and `false` otherwise.

== Synopsis

Declared in `<bdlar_nullablevalueref.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
bdlat_nullableValueIsNull(xref:BloombergLP/bdlar/NullableValueRef.adoc[NullableValueRef] const& ref);
----

== Return Value

`true` if null, and `false` otherwise

== Parameters

[cols="1,4"]
|===
| Name| Description
| *ref*
| nullable‐value reference to query
|===


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