title: std::list or std::multimap
body: <p>Hey, I right now have a list of a struct that I made, I sort this list everytime I add a new object, using the std::list sort method.
  I want to know what would be faster, using a std::multimap for this or std::list,
  since I'm iterating the whole list every frame (I am making a game).</p>
  
  <p>I would like to hear your opinion, for what should I use for this incident.</p>