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template<class T, class X> class Obj {
T my_t;
X my_x;
public:
Obj(T t, X x) : my_t(t), my_x(x) { }
};
Referring to the sample code above, which one of the
following is a valid conversion operator for the type T?
a) T operator T () { return my_t; }
b) T operator(T) const { return my_t; }
c) operator(T) { return my_t; }
d) T operator T (const Obj &obj) { return obj.my_t; }
e) operator T () const { return my_t; }
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STL 
