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      namespace B {
  template <class _CharT>
  struct basic_ostream {
    basic_ostream& operator<<(basic_ostream& (*__pf)());
  };
  template <class _CharT> basic_ostream<_CharT>&
  endl();
  struct S1 {
    template <class _CharT> friend void
    operator<<(basic_ostream<_CharT>& __os, const S1& __x);
  };
  S1 setw(int __n);
  template <class _CharT> class S2;
  template <class _CharT> void
  operator<<(basic_ostream<_CharT>& __os, const S2<_CharT>& __x);
  template <class _CharT>
  struct S2 {
    template <class _Cp> friend void
    operator<<(basic_ostream<_Cp>& __os, const S2<_Cp>& __x);
  };
}
 
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