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

Return the address of the modifiable first element in this vector, or a valid, but non‐dereferenceable pointer value if this vector is empty.

== Synopsis

Declared in `<bslstl_vector.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/balm/MetricSampleGroup.adoc[MetricSampleGroup]*
data() noexcept;
----


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