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Question #225 Difficulty: 2

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

    #include <iostream>

struct X {
    X() { std::cout << "1"; }
    X(const X &) { std::cout << "3"; }
    ~X() { std::cout << "2"; }

    void f() { std::cout << "4"; }

} object;

int main() {
    X(object);
    object.f();
}

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