28 Input/output library [input.output]

28.4 Standard iostream objects [iostream.objects]

28.4.1 Header <iostream> synopsis [iostream.syn]

#include <ios>          // see [ios.syn]
#include <streambuf>    // see [streambuf.syn]
#include <istream>      // see [istream.syn]
#include <ostream>      // see [ostream.syn]

namespace std {
  extern istream cin;
  extern ostream cout;
  extern ostream cerr;
  extern ostream clog;

  extern wistream wcin;
  extern wostream wcout;
  extern wostream wcerr;
  extern wostream wclog;
}