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