[#bsl-basic_stringbuf-pbackfail-05]
= xref:bsl.adoc[bsl]::xref:bsl/basic_stringbuf.adoc[basic_stringbuf]::pbackfail
:relfileprefix: ../../
:mrdocs:

Put back the specified `character` into the input sequence so that the next character read from the input sequence will be `character`. If `character` is either `traits_type::eof()` or is the same as the previously read character from the input sequence, then adjust the current input position, `gptr`, back one position. If `character` is neither `traits_type::eof()` nor the character previously read from the input sequence, but this string buffer was opened for writing (`ios_base::out`), then adjust the input sequence back one position and write `character` to that position. Return the character that was put back on success and `traits_type::eof()` if either the input position is currently at the beginning of the sequence or if the previous character in the input sequence is not `character` and this buffer was not opened for writing.

== 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]
pbackfail(xref:bsl/basic_stringbuf/int_type.adoc[int_type] character = traits_type::eof());
----


[.small]#Created with https://www.mrdocs.com[MrDocs]#