[#bsl-basic_stringbuf-underflow]
= xref:bsl.adoc[bsl]::xref:bsl/basic_stringbuf.adoc[basic_stringbuf]::underflow
:relfileprefix: ../../
:mrdocs:

Return the character at the current input position, if a character is available, and `traits_type::eof()` otherwise. Update the end of the input area, `egptr`, if additional characters are available (as may occur if additional characters have been written to the string buffer). Note that this operation is similar to `uflow`, but does not advance the current input position.

== Synopsis

Declared in `<bslstl_stringbuf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
xref:bsl/basic_stringbuf/int_type.adoc[basic_stringbuf<CHAR_TYPE, CHAR_TRAITS, ALLOCATOR>::int_type]
underflow();
----


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