int_type overflow(int_type c = EOF) override;
int_type pbackfail(int_type c = EOF) override;
int_type underflow() override;
pos_type seekoff(off_type off, seekdir way, openmode which = in | out) override;
Conditions | Result | |
(which & ios::in) != 0 | positions the input sequence | |
(which & ios::out) != 0 | positions the output sequence | |
(which & (ios::in | ios::out)) == (ios::in | ios::out) and either way == ios::beg or way == ios::end | positions both the input and the output sequences | |
Otherwise | the positioning operation fails. |
pos_type seekpos(pos_type sp, ios_base::openmode which = ios_base::in | ios_base::out) override;
streambuf<char>* setbuf(char* s, streamsize n) override;