31.5.4 Class template basic_ios [ios]
namespace std {
template<class charT, class traits = char_traits<charT>>
class basic_ios : public ios_base {
public:
using char_type = charT;
using int_type = typename traits::int_type;
using pos_type = typename traits::pos_type;
using off_type = typename traits::off_type;
using traits_type = traits;
explicit operator bool() const;
bool operator!() const;
iostate rdstate() const;
void clear(iostate state = goodbit);
void setstate(iostate state);
bool good() const;
bool eof() const;
bool fail() const;
bool bad() const;
iostate exceptions() const;
void exceptions(iostate except);
explicit basic_ios(basic_streambuf<charT, traits>* sb);
virtual ~basic_ios();
basic_ostream<charT, traits>* tie() const;
basic_ostream<charT, traits>* tie(basic_ostream<charT, traits>* tiestr);
basic_streambuf<charT, traits>* rdbuf() const;
basic_streambuf<charT, traits>* rdbuf(basic_streambuf<charT, traits>* sb);
basic_ios& copyfmt(const basic_ios& rhs);
char_type fill() const;
char_type fill(char_type ch);
locale imbue(const locale& loc);
char narrow(char_type c, char dfault) const;
char_type widen(char c) const;
basic_ios(const basic_ios&) = delete;
basic_ios& operator=(const basic_ios&) = delete;
protected:
basic_ios();
void init(basic_streambuf<charT, traits>* sb);
void move(basic_ios& rhs);
void move(basic_ios&& rhs);
void swap(basic_ios& rhs) noexcept;
void set_rdbuf(basic_streambuf<charT, traits>* sb);
};
}