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>

virtual
int_type
pbackfail(int_type c = bsl::streambuf::traits_type::eof()) override;

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