title: Class vs data structure
body: <p>In object oriented programming, a custom class (like Person class with data of Name, list of addresses, etc)holds data and can include collection objects too.  A data structure is also used to hold data too. So, is a class considered advanced data structure conceptually ? And in design of efficient systems (in object oriented world and large systems), are classes considered as similar to data structures and algorithmic analysis done for efficient classes designs for greater efficiency(in companies like google, facebook) ?  </p>