concurrency-in-action/source/listing_5.3.cpp

#include <iostream>

void
foo(int a, int b)
{
  std::cout << a <<”,”<< b << std::endl;
}

int
get_num()
{
  static int i = 0;
  return ++i;
}

int
main()
{
  foo(get_num(), get_num());
}