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Question #228 Difficulty: 3

According to the C++17 standard, what is the output of this program? 

    template <typename ...Ts>
struct X {
  X(Ts ...args) : Var(0, args...) {}
  int Var;
};

int main() {
  X<> x;
}

Hint:

If every valid specialization of a variadic template requires an empty template parameter pack, the program is ill-formed, no diagnostic required.

Answer:

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