It is used in pointer to beginning of output sequence and returns a pointer to the first element of the array with the portion of the controlled output sequence that is currently buffered.
Following is the declaration for std::basic_streambuf::pbase.
char_type* pbase() const;
It returns a pointer to the beginning of an array with the part of the controlled output sequence that is currently buffered.
Strong guarantee − if an exception is thrown, there are no changes in the stream buffer.
It accesses the stream buffer object.