explicit basic_ostream(basic_streambuf<charT, traits>* sb);
Effects: Constructs an object of class basic_ostream, initializing the base class subobject with basic_ios<charT, traits>::init(sb) ([basic.ios.cons]).
basic_ostream(basic_ostream&& rhs);
Effects: Move constructs from the rvalue rhs. This is accomplished by default constructing the base class and calling basic_ios<charT, traits>::move(rhs) to initialize the base class.
virtual ~basic_ostream();