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

This struct stores a series of function pointers to wrappers that invoke the underlying methods 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 NullableValueVtable;
----

== Type Aliases

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlar/NullableValueVtable/MakeValue.adoc[`MakeValue`] 
| Function pointer type assigning the default value for the contained type to a nullable value&period;
| xref:BloombergLP/bdlar/NullableValueVtable/ManipulateValue.adoc[`ManipulateValue`] 
| Function pointer type manipulating the non&hyphen;null value of a nullable value&period;
| xref:BloombergLP/bdlar/NullableValueVtable/Reset.adoc[`Reset`] 
| Function pointer type resetting a nullable value to its default value&period;
|===


== Data Members

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlar/NullableValueVtable/d_const.adoc[`d&lowbar;const`] 
| read&hyphen;only vtable
| xref:BloombergLP/bdlar/NullableValueVtable/d_makeValue_fp.adoc[`d&lowbar;makeValue&lowbar;fp`] 
| make non&hyphen;null value
| xref:BloombergLP/bdlar/NullableValueVtable/d_manipulateValue_fp.adoc[`d&lowbar;manipulateValue&lowbar;fp`] 
| non&hyphen;null value manipulator
| xref:BloombergLP/bdlar/NullableValueVtable/d_reset_fp.adoc[`d&lowbar;reset&lowbar;fp`] 
| reset function
|===



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