Annex D (normative) Compatibility features [depr]

D.7 char* streams [depr.str.strstreams]

D.7.2 Class istrstream [depr.istrstream]

D.7.2.2 Member functions [depr.istrstream.members]

strstreambuf* rdbuf() const;
Returns: const_­cast<strstreambuf*>(&sb).
char* str();
Returns: rdbuf()->str().