Instance variables, default being atomic
<p>I'm not quite sure if I understand atomic correctly. From what I read, it says that atomic is the default for the iPhone.  Now is that for properties only, or any instance variable.  For example, if I have an instance variable that I am going to write my own setters/getters, and do not declare it as a property, does that make that instance variable atomic?  Is the downside mainly that it is optimized for threading, which my instance variable / application might not even need?  Thanks.</p>
