[#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&hyphen;defined object and `false` otherwise&period; If this method returns `false`, calling `destroy` on this object will release the memory used by the array, string, or used&hyphen;defined object as well as any meta&hyphen;data directly used by this datum (e&period;g&period;, length information)&semi; otherwise (if this method returns `true`) calling `destroy` on this object will release any allocated meta&hyphen;data, but will not impact the externally managed array, string, or user&hyphen;defined object&period;

== Synopsis

Declared in `&lt;bdld&lowbar;datum&period;h&gt;`

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


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