27 Input/output library [input.output]

27.7 Formatting and manipulators [iostream.format]

27.7.2 Input streams [input.streams]

27.7.2.6 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:
    using char_type   = charT;
    using int_type    = typename traits::int_type;
    using pos_type    = typename traits::pos_type;
    using off_type    = typename traits::off_type;
    using traits_type = traits;

    // [iostream.cons], constructor
    explicit basic_iostream(basic_streambuf<charT, traits>* sb);

    // [iostream.dest], destructor
    virtual ~basic_iostream();

  protected:
    // [iostream.cons], constructor
    basic_iostream(const basic_iostream& rhs) = delete;
    basic_iostream(basic_iostream&& rhs);

    // [iostream.assign], assign and swap
    basic_iostream& operator=(const basic_iostream& rhs) = delete;
    basic_iostream& operator=(basic_iostream&& rhs);
    void swap(basic_iostream& rhs);
  };
}
1

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

27.7.2.6.1 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

Postconditions: 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).

27.7.2.6.2 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().

27.7.2.6.3 basic_iostream assign and swap [iostream.assign]

basic_iostream& operator=(basic_iostream&& rhs);

1

Effects: As if by swap(rhs).

void swap(basic_iostream& rhs);

2

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