Generic lambda with static local variable

Question | Jul 11, 2019 | nextptr 

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A lambda with auto parameter(s) is called generic lambda. Consider a simple generic lambda with a static local variable defined as:

auto lambda = []( auto x ) {
  static int y = 0;   // static local
  return ++y + x;
};

What would be the result of calling above lambda three times as:

std::cout << lambda(1) << " "
          << lambda(1.0) << " "
          << lambda(1) << std::endl;

Choose the correct answer below (check Explanations for explanation of answer):

2015 nextptr