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Question #196 Difficulty: 2

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

    #include <iostream>

namespace x {
  class C {};
  void f(const C& i) {
    std::cout << "1";
  }
}

namespace y {
  void f(const x::C& i) {
    std::cout << "2";
  }
}

int main() {
  f(x::C());
}

Hint:

Argument-dependent name lookup, aka Koenig lookup, applies.

Answer:

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