struct T1
{
    operator int() const { return 1; }
    operator float() const { return 2.0f; }
};

template<class T3>
struct T2
{
    T2(const T3& t3) { f(t3); }
    static void f(int) {  }
    static void f(float) {  }
};

int main()
{
    T1 t1;
    T2<int> t2_1(1);
    T2<float> t2_2(2.0);
    T2<T1> t2_3(t1);
}