[#BloombergLP-bslstl-RandomAccessIterator-operator_subs]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/RandomAccessIterator.adoc[RandomAccessIterator]::operator[]
:relfileprefix: ../../../
:mrdocs:

Return a reference to the element at the specified `index` positions past the current one. The behavior is undefined unless the referenced position lies within the underlying sequence. Note that `index` may be negative.

== Synopsis

Declared in `<bslstl_randomaccessiterator.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
T&
operator[](xref:BloombergLP/bslstl/RandomAccessIterator/difference_type.adoc[difference_type] index) const;
----


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