[#BloombergLP-bdld-Datum-isExternalReference]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdld.adoc[bdld]::xref:BloombergLP/bdld/Datum.adoc[Datum]::isExternalReference
:relfileprefix: ../../../
:mrdocs:

Return `true` if this object represents a reference to an externally managed array, string or user‐defined object and `false` otherwise. If this method returns `false`, calling `destroy` on this object will release the memory used by the array, string, or used‐defined object as well as any meta‐data directly used by this datum (e.g., length information); otherwise (if this method returns `true`) calling `destroy` on this object will release any allocated meta‐data, but will not impact the externally managed array, string, or user‐defined object.

== Synopsis

Declared in `<bdld_datum.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
bool
isExternalReference() const;
----


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