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

This struct stores a series of function pointers to wrappers that invoke the underlying methods with read&hyphen;only access of the supplied type erased object that implement the &quot;nullable value&quot; type category&period;

== Synopsis

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

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
struct NullableValueConstVtable;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlar/NullableValueConstVtable/AccessValue.adoc[`AccessValue`] 
| Function pointer type accessing the non&hyphen;null value of a nullable value&period;
| xref:BloombergLP/bdlar/NullableValueConstVtable/IsNull.adoc[`IsNull`] 
| Function pointer type indicating whether a nullable value is null&period;
| xref:BloombergLP/bdlar/NullableValueConstVtable/ValueCategory.adoc[`ValueCategory`] 
| Function pointer type returning the value type category of a nullable value&period;
| xref:BloombergLP/bdlar/NullableValueConstVtable/XsdName.adoc[`XsdName`] 
| Function pointer type returning the XSD name of a nullable value&period;
|===


== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlar/NullableValueConstVtable/d_accessValue_fp.adoc[`d&lowbar;accessValue&lowbar;fp`] 
| non&hyphen;null value accessor
| xref:BloombergLP/bdlar/NullableValueConstVtable/d_isNull_fp.adoc[`d&lowbar;isNull&lowbar;fp`] 
| null predicate
| xref:BloombergLP/bdlar/NullableValueConstVtable/d_valueCategory_fp.adoc[`d&lowbar;valueCategory&lowbar;fp`] 
| value type category accessor
| xref:BloombergLP/bdlar/NullableValueConstVtable/d_xsdName_fp.adoc[`d&lowbar;xsdName&lowbar;fp`] 
| XSD name accessor
|===



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