class Type1
{
public:
    template<typename T>
    Type& operator&(T t){t.serialize(*this);return *this;}
    template<>Type& operator&(int t){/*полезные действия*/return *this;}
};

class Type2
{
public:
    template<typename T>
    Type& operator&(T t){t.serialize(*this);return *this;}
    template<>Type& operator&(int t){/*полезные действия*/return *this;}
};

class C
{
    int v;

    template<typename T> friend T& T::operator&(C);
    template <class T> T& serialize(T&t){t&v; return t;}
public:
    ...
};

//------------------------------------------------------------------------------
int _tmain(int argc, _TCHAR* argv[])//
{
    Type t;
    C c;
    t & c & c & c;
    return 0;
}

template<typename T> friend class T;
friend Type& Type::operator&(class C);
friend Type& operator&(class Type,class C);
template<class T>friend T& class T::operator&(C);
template<typename T> friend T& T::operator& < T > (class C);

class C
{
    int v = 10;

    template<typename T> friend T& operator&(T&, const C&);
    template <class T> T& serialize(T&t) const { t&v; return t; }
};

template<typename T>
T& operator&(T& t, const C& c)
{
    c.serialize(t); return t;
}

class Type1
{
public:
    Type1& operator&(int t) {/*полезные действия*/return *this; }
};

class Type2
{
public:
    Type2& operator&(int t) {/*полезные действия*/return *this; }
};