[#BloombergLP-bdlat-NullableValueUtil-accessValueByCategory]
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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.

== Synopsis

Declared in `<bdlat_nullablevalueutil.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class TYPE,
    class ACCESSOR>
static
int
accessValueByCategory(
    TYPE const& object,
    ACCESSOR& accessor);
----


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