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

== Synopsis

Declared in `<bdlsb_overflowmemoutstreambuf.h>`

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


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