[#BloombergLP-balst-StackTrace-operator_subs-08]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balst.adoc[balst]::xref:BloombergLP/balst/StackTrace.adoc[StackTrace]::operator&lsqb;&rsqb;
:relfileprefix: ../../../
:mrdocs:

Return a reference providing non&hyphen;modifiable access to the stack&hyphen;trace frame at the specified `index`&period; The behavior is undefined unless `0 &lt;&equals; index &lt; length()`&period;

== Synopsis

Declared in `&lt;balst&lowbar;stacktrace&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/balst/StackTraceFrame.adoc[StackTraceFrame] const&
operator&lsqb;&rsqb;(int index) const;
----

== Return Value

reference providing non&hyphen;modifiable access to the frame at `index`

== Parameters

[cols="1,4"]
|===
| Name| Description
| *index*
| zero&hyphen;based index of the stack&hyphen;trace frame
|===


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