[#bsl-basic_syncbuf-uflow]
= xref:bsl.adoc[bsl]::xref:bsl/basic_syncbuf.adoc[basic_syncbuf]::uflow
:relfileprefix: ../../
:mrdocs:

Fetches more data from the controlled sequence.

== Synopsis

Declared in `<bslstl_syncbuf.h>`

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

== Description

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

== Return Value

The first character from the _pending sequence_.


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