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Question #235 Difficulty: 2

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

    #include <initializer_list>
#include <iostream>

class C {
public:
    C() = default;
    C(const C&) { std::cout << 1; }
};

void f(std::initializer_list<C> i) {}

int main() {
    C c;
    std::initializer_list<C> i{c};
    f(i);
    f(i);
}

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