[#VecDeque-operator_subs-09]
= xref:VecDeque.adoc[VecDeque]::operator[]
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Subscript operators

== Synopses

Declared in `<util/vecdeque.h>`

Get a mutable reference to the element in the deque at the given index. Requires idx < size().


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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T&
xref:VecDeque/operator_subs-03.adoc[operator[]](size_t idx) noexcept;
----

[.small]#xref:VecDeque/operator_subs-03.adoc[_» more..._]#

Get a const reference to the element in the deque at the given index. Requires idx < size().


[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
T const&
xref:VecDeque/operator_subs-0f.adoc[operator[]](size_t idx) const noexcept;
----

[.small]#xref:VecDeque/operator_subs-0f.adoc[_» more..._]#

== Return Value

* A mutable reference to the element at idx.
* A const reference to the element at idx.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *idx*
| The zero‐based logical index of the element.
|===


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