[#BloombergLP-balm-MetricSample-begin]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balm.adoc[balm]::xref:BloombergLP/balm/MetricSample.adoc[MetricSample]::begin
:relfileprefix: ../../../
:mrdocs:

Return an iterator positioned at the beginning of the sequence of `MetricSampleGroup` objects contained by this object. Note that the iterator will remain valid until this sample is modified by invoking either `appendGroups` or `removeAllRecords()`.

== Synopsis

Declared in `<balm_metricsample.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/balm/MetricSample/const_iterator.adoc[MetricSample::const_iterator]
begin() const;
----


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