namespace std {
    template <class charT,
              class traits = char_traits<charT>,
              class Allocator = allocator<charT> >
      class basic_istringstream;
    typedef basic_istringstream <char>    istringstream;
    typedef basic_istringstream<wchar_t> wistringstream;
    template <class charT,
              class traits = char_traits<charT>,
              class Allocator = allocator<charT> >
      class basic_ostringstream;
    typedef basic_ostringstream<char>    ostringstream;
    typedef basic_ostringstream<wchar_t> wostringstream;

    template <class charT,
              class traits = char_traits<charT>,
              class Allocator = allocator<charT> >
      class basic_stringstream;
    typedef basic_stringstream<char>    stringstream;
    typedef basic_stringstream<wchar_t> wstringstream;

    template <class charT,
              class traits = char_traits<charT>,
              class Allocator = allocator<charT> >
      class basic_filebuf;
    typedef basic_filebuf<char>    stringbuf;
    typedef basic_filebuf<wchar_t> wstringbuf;
}