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>

struct NullableValueUtil;

Static Member Functions

Name

Description

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.

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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