title: How to iterate through a fd_set
body: <p>I'm wondering if there's an easy way to iterate through a fd_set? The reason I want to do this is to not having to loop through all connected sockets, since select() alters these fd_sets to only include the ones I'm interested about. I also know that using an implementation of a type that is not meant to be directly accessed is generally a bad idea since it may vary across different systems. However, I need some way to do this, and I'm running out of ideas. So, my question is:</p>
  
  <p>How do I iterate through an fd_set? If this is a really bad practice, are there any other ways to solve my "problem" except from looping through all connected sockets?</p>
  
  <p>Thanks</p>