std::iostream::iostream

initialization (1)	explicit iostream (streambuf* sb);

initialization (1)	explicit iostream (streambuf* sb);
copy (2)	iostream& (const iostream&) = delete;
move (3)	protected: iostream& (iostream&& x);

Construct object

Constructs a iostream object.

(1) inititalization constructor: Assigns initial values to the components of its base classes by calling the constructors its base classes istream and ostream with sb as argument.
Notice that this calls member ios::init twice.
(2) copy constructor (deleted): Deleted: no copy constructor.
(3) move constructor (protected): Acquires the contents of x, except its associated stream buffer: It calls istream's constructor with move(x) as argument, transferring some of x's internal components to the object: x is left with a gcount value of zero, not tied, and with its associated stream buffer unchanged (all other components of x are in an unspecified but valid state after the call).

sb: pointer to a streambuf object with the same template parameters as the iostream object.
char_type and traits_type are member types defined as aliases of the first and second class template parameters, respectively (see iostream types).
x: Another iostream of the same type (with the same class template arguments charT and traits).

The object pointed by sb may be accessed and/or modified.

If an exception is thrown, the only side effects may come from accessing/modifying sb.