[#bsl-Deque_Base-back-0e]
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Return a reference providing modifiable access to the last element in this deque&period; The behavior is undefined unless this deque is not empty&period;

== Synopsis

Declared in `&lt;bslstl&lowbar;deque&period;h&gt;`

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xref:bsl/Deque_Base/reference.adoc[Deque&lowbar;Base&lt;VALUE&lowbar;TYPE&gt;::reference]
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