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namespace std{template<class CharT,class Traits= char_traits<CharT>>class basic_streambuf;using streambuf= basic_streambuf<char>;using wstreambuf= basic_streambuf<wchar_t>;}

namespace std{template<class CharT,class Traits= char_traits<CharT>>class basic_streambuf{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; virtual ~basic_streambuf(); // locales    locale   pubimbue(const locale& loc);    locale   getloc()const; // buffer and positioning    basic_streambuf* pubsetbuf(char_type* s, streamsize n);    pos_type pubseekoff(off_type off, ios_base::seekdir way,                        ios_base::openmode which= ios_base::in| ios_base::out);    pos_type pubseekpos(pos_type sp,                        ios_base::openmode which= ios_base::in| ios_base::out);int      pubsync(); // get and put areas// get area    streamsize in_avail();    int_type snextc();    int_type sbumpc();    int_type sgetc();    streamsize sgetn(char_type* s, streamsize n); // putback    int_type sputbackc(char_type c);    int_type sungetc(); // put area    int_type   sputc(char_type c);    streamsize sputn(const char_type* s, streamsize n); protected:    basic_streambuf();    basic_streambuf(const basic_streambuf& rhs);    basic_streambuf& operator=(const basic_streambuf& rhs); void swap(basic_streambuf& rhs); // get area access    char_type* eback()const;    char_type* gptr()const;    char_type* egptr()const;void       gbump(int n);void       setg(char_type* gbeg, char_type* gnext, char_type* gend); // put area access    char_type* pbase()const;    char_type* pptr()const;    char_type* epptr()const;void       pbump(int n);void       setp(char_type* pbeg, char_type* pend); // virtual functions// localesvirtualvoid imbue(const locale& loc); // buffer management and positioningvirtual basic_streambuf* setbuf(char_type* s, streamsize n);virtual pos_type seekoff(off_type off, ios_base::seekdir way,                             ios_base::openmode which= ios_base::in| ios_base::out);virtual pos_type seekpos(pos_type sp,                             ios_base::openmode which= ios_base::in| ios_base::out);virtualint      sync(); // get areavirtual streamsize showmanyc();virtual streamsize xsgetn(char_type* s, streamsize n);virtual int_type   underflow();virtual int_type   uflow(); // putbackvirtual int_type   pbackfail(int_type c= Traits::eof()); // put areavirtual streamsize xsputn(const char_type* s, streamsize n);virtual int_type   overflow(int_type c= Traits::eof());};}