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namespace std{class strstreambuf;class istrstream;class ostrstream;class strstream;}

namespace std{class strstreambuf:public basic_streambuf<char>{public:    strstreambuf(): strstreambuf(0){}explicit strstreambuf(streamsize alsize_arg);    strstreambuf(void*(*palloc_arg)(size_t),void(*pfree_arg)(void*));    strstreambuf(char* gnext_arg, streamsize n,char* pbeg_arg= nullptr);    strstreambuf(constchar* gnext_arg, streamsize n);     strstreambuf(signedchar* gnext_arg, streamsize n,signedchar* pbeg_arg= nullptr);    strstreambuf(constsignedchar* gnext_arg, streamsize n);    strstreambuf(unsignedchar* gnext_arg, streamsize n,unsignedchar* pbeg_arg= nullptr);    strstreambuf(constunsignedchar* gnext_arg, streamsize n); virtual ~strstreambuf(); void  freeze(bool freezefl=true);char* str();int   pcount(); protected:    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, ios_base::seekdir way,                     ios_base::openmode which= ios_base::in| ios_base::out) override;    pos_type seekpos(pos_type sp,                     ios_base::openmode which= ios_base::in| ios_base::out) override;    streambuf* setbuf(char* s, streamsize n) override; private:using strstate=/*bitmask type*/;// exposition onlystaticconst strstate allocated;// exposition onlystaticconst strstate constant;// exposition onlystaticconst strstate dynamic;// exposition onlystaticconst strstate frozen;// exposition only    strstate strmode;// exposition only    streamsize alsize;// exposition onlyvoid*(*palloc)(size_t);// exposition onlyvoid(*pfree)(void*);// exposition only};}

namespace std{class istrstream:public basic_istream<char>{public:explicit istrstream(constchar* s);explicit istrstream(char* s);    istrstream(constchar* s, streamsize n);    istrstream(char* s, streamsize n);virtual ~istrstream();     strstreambuf* rdbuf()const;char* str();private:    strstreambuf sb;// exposition only};}

namespace std{class ostrstream:public basic_ostream<char>{public:    ostrstream();    ostrstream(char* s,int n, ios_base::openmode mode= ios_base::out);virtual ~ostrstream();     strstreambuf* rdbuf()const;void freeze(bool freezefl=true);char* str();int pcount()const;private:    strstreambuf sb;// exposition only};}

namespace std{class strstream:public basic_iostream<char>{public:// typesusing char_type=char;using int_type= char_traits<char>::int_type;using pos_type= char_traits<char>::pos_type;using off_type= char_traits<char>::off_type; // constructors/destructor    strstream();    strstream(char* s,int n,              ios_base::openmode mode= ios_base::in| ios_base::out);virtual ~strstream(); // members    strstreambuf* rdbuf()const;void freeze(bool freezefl=true);int pcount()const;char* str(); private:    strstreambuf sb;// exposition only};}