Construct an object.
  If called with the public syntax sets the initial values to its member objects by calling init(sb);
  If called by a derived class using the protected syntax it constructs an object leaving its members uninitialized. In this case the object shall be initialized calling init before it is destroyed.

Parameters.

sb

pointer to a streambuf object.

Return Value.
  None (constructor).

Basic template member declaration ( basic_ios<charT,traits> ):

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

See also.
  init
  ios class