[#BloombergLP-bdlat-NullableValueUtil]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlat.adoc[bdlat]::NullableValueUtil
:relfileprefix: ../../
:mrdocs:

This `struct` provides a namespace for a suite of function templates providing non‐primitive operations on "nullable value" types.

== Synopsis

Declared in `<bdlat_nullablevalueutil.h>`

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

== Static Member Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlat/NullableValueUtil/accessValueByCategory.adoc[`accessValueByCategory`] 
| Invoke the specified `accessor` on the non‐modifiable value stored in the specified "nullable" `object` and on a prvalue of the category tag type for the dynamic category of the value. See {`bdlat_typecategory`|Category Tags and Enumerators} for documentation about category tags. Return the value from the invocation of `accessor`. The `accessor` must be an accessor functor. See {`bdlat_typecategory`|`ACCESSOR` Functors} for the requirements on `accessor`. The behavior is undefined if `object` contains a null value.
| xref:BloombergLP/bdlat/NullableValueUtil/manipulateValueByCategory.adoc[`manipulateValueByCategory`] 
| Invoke the specified `manipulator` on the address of the value stored in the specified "nullable" `object` and on a prvalue of the category tag type for the dynamic category of the value. See {`bdlat_typecategory`|Category Tags and Enumerators} for documentation about category tags. Return the value from the invocation of `manipulator`. The `manipulator` must be a manipulator functor. See {`bdlat_typecategory`|`MANIPULATOR` Functors} for the requirements on `manipulator`. The behavior is undefined if `object` contains a null value.
|===



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