std::basic_ios<CharT,Traits>::set_rdbuf (3) - Linux Man Pages
void set_rdbuf( std::basic_streambuf<CharT,Traits>* sb );
Sets the associated stream buffer to sb without clearing the error state.
This member function is protected: it is called by the move constructors of the derived streams such as std::basic_ofstream or std::basic_istringstream, as the final step after constructing the base class and after moving the stream buffer: only the most derived stream class knows how to correctly move the stream buffer, but std::basic_ios needs to be made aware of the stream's new location so that its public member functions can access it.
sb - stream buffer to associate to
This section is incomplete
Reason: no example
rdbuf (public member function)