[#bsl-Deque_Base-at-06] = xref:bsl.adoc[bsl]::xref:bsl/Deque_Base.adoc[Deque_Base]::at :relfileprefix: ../../ :mrdocs: Return a reference providing modifiable access to the element at the specified `position` in this deque. Throw a `std::out_of_range` exception if `position >= size()`. == Synopsis Declared in `<bslstl_deque.h>` [source,cpp,subs="verbatim,replacements,macros,-callouts"] ---- xref:bsl/Deque_Base/reference.adoc[Deque_Base<VALUE_TYPE>::reference] at(xref:bsl/Deque_Base/size_type.adoc[size_type] position); ---- [.small]#Created with https://www.mrdocs.com[MrDocs]#