Invoke a categorized accessor on the value held by a nullable object.
Declared in <bdlat_nullablevalueutil.h>
template<
class TYPE,
class ACCESSOR>
static
int
accessValueByCategory(
TYPE const& object,
ACCESSOR& accessor);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.
value from the invocation of accessor
| Name | Description |
|---|---|
| object | "nullable" object whose held value is accessed |
| accessor | functor applied to the held value with a category tag |