[#BloombergLP-bdlbb-InBlobStreamBuf-underflow]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bdlbb.adoc[bdlbb]::xref:BloombergLP/bdlbb/InBlobStreamBuf.adoc[InBlobStreamBuf]::underflow
:relfileprefix: ../../../
:mrdocs:

Adjust the underlying blob so that the next read position is valid. Return the character at `gptr()` on success and `traits_type::eof()` otherwise.

== Synopsis

Declared in `<bdlbb_blobstreambuf.h>`

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


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