DG>int main()
DG>{
DG>  std::wifstream ifs ("input.txt");
DG>  int i = 0;
DG>  ifs >> i;
DG>  std::wstring s;
DG>  ifs >> w;
DG>  std::wstring line;
DG>  std::getline (ifs, line);  
DG>}
DG>

DG>#include <fstream>
DG>#include <sstream>

DG>void main()
DG>{
DG>  std::wstringstream wss;
DG>  wss << L"Мой текст" << L"\r";
DG>  wss << L"My text" << L"\r";
DG>  wss << 45 << L"\r";
DG>  std::ofstream ofs2 ("unicode.2.txt");
DG>  ofs2.write ((char*)wss.str().c_str(), wss.str().size() * 2);
DG>}
DG>

ME>According to the standard, "A File provides an external source/sink
ME>stream whose underlaid character type is char (byte)." This is true
ME>even for wide character streams; the extra characters are represented
ME>as multibyte sequences, say in UTF-8.

ME>(While I'm at it, I might also remind that the standard doesn't
ME>guarantee, or even recommend, Unicode for wchar_t, nor does it
ME>guarantee that a wchar_t is large enough to hold a Unicode character.
ME>Since you speak of Windows NT, however, I don't think that this is a
ME>problem in your case.)

ME>>According to the standard, "A File provides an external source/sink
ME>>stream whose underlaid character type is char (byte)." This is true
ME>>even for wide character streams; the extra characters are represented
ME>>as multibyte sequences, say in UTF-8.

ME>>(While I'm at it, I might also remind that the standard doesn't
ME>>guarantee, or even recommend, Unicode for wchar_t, nor does it
ME>>guarantee that a wchar_t is large enough to hold a Unicode character.
ME>>Since you speak of Windows NT, however, I don't think that this is a
ME>>problem in your case.)