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

This `typedef` is an alias to `VALUE_TYPE const&`.

== Synopsis

Declared in `<bslstl_vector.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef xref:BloombergLP/balm/MetricSampleGroup.adoc[MetricSampleGroup] const& const_reference;
----


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