#include <thread>

void
do_something(int& i)
{
  ++i;
}

struct func {
  int& i;

  func(int& i_) : i(i_) {}

  void operator()()
  {
    for (unsigned j = 0; j < 1000000; ++j) {
      do_something(i);
    }
  }
};

void
oops()
{
  int some_local_state = 0;
  func my_func(some_local_state);
  std::thread my_thread(my_func);
  my_thread.detach();
}

int
main()
{
  oops();
}