[#bsl-basic_syncbuf-uflow]
= xref:bsl.adoc[bsl]::xref:bsl/basic_syncbuf.adoc[basic&lowbar;syncbuf]::uflow
:relfileprefix: ../../
:mrdocs:

Fetches more data from the controlled sequence&period;

== Synopsis

Declared in `&lt;bslstl&lowbar;syncbuf&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
int&lowbar;type
uflow();
----

== Description

Informally, this function does the same thing as `underflow(),` and in fact is required to call that function&period; It also returns the new character, like `underflow()` does&period; However, this function also moves the read position forward by one&period;

== Return Value

The first character from the _pending sequence_&period;


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