[#BloombergLP-ball-UserFields-operator_subs-0d]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/ball.adoc[ball]::xref:BloombergLP/ball/UserFields.adoc[UserFields]::operator[]
:relfileprefix: ../../../
:mrdocs:

Return a reference providing modifiable access to the value at the specified `index`. The behavior is undefined unless `0 <= index && index < length()`.

== Synopsis

Declared in `<ball_userfields.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/ball/UserFieldValue.adoc[UserFieldValue]&
operator[](int index);
----


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