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

This `namespace` provides functions that expose "nullable" behavior for "nullable value" types. See the component‐level documentation for more information.

== Types

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlat_NullableValueFunctions/IsNullableValue-030.adoc[`IsNullableValue`] 
| This `struct` should be specialized for third‐party types that need to expose "nullable" behavior. See the component‐level documentation for further information.
| xref:BloombergLP/bdlat_NullableValueFunctions/ValueType-08.adoc[`ValueType`] 
| This meta‐function should contain a typedef `Type` that specifies the type of value stored in a nullable type of the parameterized `TYPE`.
|===


== Functions

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlat_NullableValueFunctions/accessValue.adoc[`accessValue`] 
| Invoke the specified `accessor` on the non‐modifiable value stored in the specified "nullable" `object`. The supplied `accessor` must be a callable type that can be called as if it had the following signature: ` int accessor(const VALUE_TYPE& value); ` Return the value from the invocation of `accessor`. The behavior is undefined unless `object` does not contain a null value.
| xref:BloombergLP/bdlat_NullableValueFunctions/bdlat_nullableValueAccessValue-0c1.adoc[`bdlat_nullableValueAccessValue`] 
| `bdlat_nullableValueAccessValue` overloads
| xref:BloombergLP/bdlat_NullableValueFunctions/bdlat_nullableValueIsNull-03.adoc[`bdlat_nullableValueIsNull`] 
| `bdlat_nullableValueIsNull` overloads
| xref:BloombergLP/bdlat_NullableValueFunctions/bdlat_nullableValueMakeValue-0c.adoc[`bdlat_nullableValueMakeValue`] 
| `bdlat_nullableValueMakeValue` overloads
| xref:BloombergLP/bdlat_NullableValueFunctions/bdlat_nullableValueManipulateValue-0d.adoc[`bdlat_nullableValueManipulateValue`] 
| `bdlat_nullableValueManipulateValue` overloads
| xref:BloombergLP/bdlat_NullableValueFunctions/isNull.adoc[`isNull`] 
| Return `true` if the specified "nullable" `object` contains a null value, and `false` otherwise.
| xref:BloombergLP/bdlat_NullableValueFunctions/makeValue.adoc[`makeValue`] 
| Assign to the specified "nullable" `object` the default value for the contained type.
| xref:BloombergLP/bdlat_NullableValueFunctions/manipulateValue.adoc[`manipulateValue`] 
| Invoke the specified `manipulator` on the address of the value stored in the specified "nullable" `object`. The supplied `manipulator` must be a callable type that can be called as if it had the following signature: ` int manipulator(VALUE_TYPE *value); ` Return the value from the invocation of `manipulator`. The behavior is undefined unless `object` does not contain a null value.
|===



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