[#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()`&period; Return `c` (or `&#126;traits&lowbar;type&colon;&colon;eof` if `c &equals;&equals; traits&lowbar;type&colon;&colon;eof`) on success, and `traits&lowbar;type&colon;&colon;eof()` otherwise&period;

== Synopsis

Declared in `&lt;bdlbb&lowbar;blobstreambuf&period;h&gt;`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
virtual
int&lowbar;type
pbackfail(int&lowbar;type c = bsl&colon;&colon;streambuf&colon;&colon;traits&lowbar;type&colon;&colon;eof()) override;
----


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