Fun C++ lambda example

tricky.cpp

#include <iostream>

int g = 0;

auto f = [g=g](auto x) mutable {
  static auto count = 0;
  std::cout << "count: " << ++count << std::endl;
  std::cout << "g: " << ++g << std::endl;
};

int main() {
  f(1);
  f(2);
  f(3.0f);
  f(4.0f);
}