[#bsl-vector-027-front-0a]
= xref:bsl.adoc[bsl]::xref:bsl/vector-027.adoc[vector<MetricSampleGroup>]::front
:relfileprefix: ../../
:mrdocs:

Return a reference providing non‐modifiable access to the first element in this vector. The behavior is undefined unless this vector is not empty.

== Synopsis

Declared in `<bslstl_vector.h>`

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


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