ostreambuf_iterator<charT,traits>&
operator=(charT c);
Effects: If failed() yields false, calls sbuf_->sputc(c); otherwise has no effect.
Returns: *this.
ostreambuf_iterator<charT,traits>& operator*();
Returns: *this.
ostreambuf_iterator<charT,traits>& operator++();
ostreambuf_iterator<charT,traits>& operator++(int);
Returns: *this.
Returns: true if in any prior use of member operator=, the call to sbuf_->sputc() returned traits::eof(); or false otherwise.