27 Input/output library [input.output]

27.7 Formatting and manipulators [iostream.format]

27.7.2 Input streams [input.streams]

27.7.2.5 Class template basic_iostream [iostreamclass]

namespace std {
  template <class charT, class traits = char_traits<charT> >
  class basic_iostream :
    public basic_istream<charT,traits>,
    public basic_ostream<charT,traits> {
  public:
    // types:
    typedef charT                     char_type;
    typedef typename traits::int_type int_type;
    typedef typename traits::pos_type pos_type;
    typedef typename traits::off_type off_type;
    typedef traits                    traits_type;

    // constructor/destructor
    explicit basic_iostream(basic_streambuf<charT,traits>* sb);
    virtual ~basic_iostream();

  protected:
    basic_iostream(const basic_iostream& rhs) = delete;
    basic_iostream(basic_iostream&& rhs);

    // assign/swap
    basic_iostream& operator=(const basic_iostream& rhs) = delete;
    basic_iostream& operator=(basic_iostream&& rhs);
    void swap(basic_iostream& rhs);
  };
}
1

The class basic_iostream inherits a number of functions that allow reading input and writing output to sequences controlled by a stream buffer.

27.7.2.5.1 basic_iostream constructors [iostream.cons]

explicit basic_iostream(basic_streambuf<charT,traits>* sb);

1

Effects: Constructs an object of class basic_iostream, assigning initial values to the base classes by calling basic_istream<charT,traits>(sb) ([istream]) and basic_ostream<charT,traits>(sb) ([ostream])

2

Postcondition: rdbuf()==sb and gcount()==0.

basic_iostream(basic_iostream&& rhs);

3

Effects: Move constructs from the rvalue rhs by constructing the basic_istream base class with move(rhs).

27.7.2.5.2 basic_iostream destructor [iostream.dest]

virtual ~basic_iostream();

1

Effects: Destroys an object of class basic_iostream.

2

Remarks: Does not perform any operations on rdbuf().

27.7.2.5.3 basic_iostream assign and swap [iostream.assign]

basic_iostream& operator=(basic_iostream&& rhs);

1

Effects: swap(rhs).

void swap(basic_iostream& rhs);

2

Effects: Calls basic_istream<charT, traits>::swap(rhs).