[#BloombergLP-bdlat_NullableValueFunctions-IsNullableValue-030]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlat_NullableValueFunctions.adoc[bdlat_NullableValueFunctions]::IsNullableValue
:relfileprefix: ../../
:mrdocs:

This `struct` should be specialized for third‐party types that need to expose "nullable" behavior. See the component‐level documentation for further information.

== Synopsis

Declared in `<bdlat_nullablevaluefunctions.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class TYPE>
struct IsNullableValue
    : xref:bsl/false_type.adoc[bsl::false_type]
----

== Base Classes

[cols="1,4"]
|===
| Name| Description
| `xref:bsl/false_type.adoc[bsl::false_type]`
| Metafunction representing the boolean constant `false`.
|===

== Specializations

[cols="1"]
|===
| Name
| xref:BloombergLP/bdlat_NullableValueFunctions/IsNullableValue-03b.adoc[`IsNullableValue<bdlar::NullableValueConstRef>`] 
| xref:BloombergLP/bdlat_NullableValueFunctions/IsNullableValue-0d4.adoc[`IsNullableValue<bdlar::NullableValueRef>`] 
| xref:BloombergLP/bdlat_NullableValueFunctions/IsNullableValue-0e.adoc[`IsNullableValue<bdlb::NullableAllocatedValue<TYPE>>`] 
| xref:BloombergLP/bdlat_NullableValueFunctions/IsNullableValue-0d2.adoc[`IsNullableValue<bdlb::NullableValue<TYPE>>`] 
|===


== Derived Classes

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlar/IsNullable.adoc[`IsNullable`] 
| Meta‐function indicating whether the specified `t_TYPE` is a nullable value type.
|===


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