class B {
public:
  int b;
};

template <class T> class C;

class A {
  int a;
public:
  A(const B &b) : a(b.b) {}
  template <class T> A &operator << (const C<T> &);
};

template <class T>
class C {
public:
  T c;
  C(const T &n) : c(n) {}
};

template <class T>
inline A &A::operator << (const C<T> &c) { a = (int)c.c; return *this; }

template <class T>
inline A &operator << (B &b, const T &c) { return A(b) << C<T>(c); }

int main() {
  B b;
  b << 1.2;
  return 0;
}