[#BloombergLP-bdlc-Queue-operator_subs-02] = xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlc.adoc[bdlc]::xref:BloombergLP/bdlc/Queue.adoc[Queue]::operator[] :relfileprefix: ../../../ :mrdocs: Subscript operators == Synopses Declared in `<bdlc_queue.h>` Return a reference to the modifiable element at the specified `index` position in this queue. The reference will remain valid as long as this queue is not destroyed or modified (e.g., via `insert`, `remove`, or `append`). The behavior is undefined unless `0 <= index < length()`. [source,cpp,subs="verbatim,replacements,macros,-callouts"] ---- T& xref:BloombergLP/bdlc/Queue/operator_subs-0d.adoc[operator[]](int index); ---- [.small]#xref:BloombergLP/bdlc/Queue/operator_subs-0d.adoc[_» more..._]# Return a reference to the non‐modifiable element at the specified `index` position in this queue. The reference will remain valid as long as this queue is not destroyed or modified (e.g., via `insert`, `remove`, or `append`). The behavior is undefined unless `0 <= index < length()`. [source,cpp,subs="verbatim,replacements,macros,-callouts"] ---- T const& xref:BloombergLP/bdlc/Queue/operator_subs-00.adoc[operator[]](int index) const; ---- [.small]#xref:BloombergLP/bdlc/Queue/operator_subs-00.adoc[_» more..._]# [.small]#Created with https://www.mrdocs.com[MrDocs]#