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

Adjust the underlying blob and put the optionally specified character `c` at the newly valid `gptr()`. Return `c` (or `~traits_type::eof` if `c == traits_type::eof`) on success, and `traits_type::eof()` otherwise.

== Synopsis

Declared in `<bdlbb_blobstreambuf.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
int_type
pbackfail(int_type c = bsl::streambuf::traits_type::eof()) override;
----


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