[#BloombergLP-bdlsb-OverflowMemOutput-dataLengthInOverflowBuffer]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlsb.adoc[bdlsb]::xref:BloombergLP/bdlsb/OverflowMemOutput.adoc[OverflowMemOutput]::dataLengthInOverflowBuffer
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Return the length of the data in the overflow buffer, i&period;e&period;, 0 if there is no overflow buffer, or `dataLength() &hyphen; initialBufferSize()` if there is one&period;

== Synopsis

Declared in `&lt;bdlsb&lowbar;overflowmemoutput&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
std::size&lowbar;t
dataLengthInOverflowBuffer() const;
----

== Return Value

length of data in the overflow buffer


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