[#bsl-vector-0b-operator_subs-0d]
= xref:bsl.adoc[bsl]::xref:bsl/vector-0b.adoc[vector<UserFieldValue>]::operator[]
:relfileprefix: ../../
:mrdocs:

Return a reference providing non‐modifiable access to the element at the specified `position` in this vector. The behavior is undefined unless `position < size()`.

== Synopsis

Declared in `<bslstl_vector.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/vectorBase-06a.adoc[const_reference]
operator[](xref:bsl/vectorBase-06a/size_type.adoc[size_type] position) const;
----


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