[#BloombergLP-bdlde-Utf8CheckingInStreamBufWrapper-underflow]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlde.adoc[bdlde]::xref:BloombergLP/bdlde/Utf8CheckingInStreamBufWrapper.adoc[Utf8CheckingInStreamBufWrapper]::underflow
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Replenish the input buffer with data obtained from the held `streambuf`, and return the next byte of input (or `eof` if no input is available). This function assumes that either the input buffer is empty or that the end of it has been reached. If this object is not in a valid state, `eof` will be returned.

== Synopsis

Declared in `<bdlde_utf8checkinginstreambufwrapper.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
int_type
underflow() override;
----


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