[#BloombergLP-bdlc-CompactedArray-uniqueElement]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/CompactedArray.adoc[CompactedArray]::uniqueElement
:relfileprefix: ../../../
:mrdocs:

Return a const reference to the unique element at the specified `index`.

== Synopsis

Declared in `<bdlc_compactedarray.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
TYPE const&
uniqueElement(std::size_t index) const;
----

== Description

Return a `const` reference to the element at the specified `index` within the sorted sequence of unique element values in this object. The behavior is undefined unless `index < uniqueLength()`. Note that `uniqueElement(index)` and `operator` can return different objects.

== Return Value

const reference to the unique element at `index`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *index*
| index into the sorted unique‐element sequence
|===


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