title: How to convert Non ARC to ARC project while project having C-Structures?
body: <p>I have an Xcode 4.5.1 . I want to convert this project to ARC to improve the performance.I am following these steps.</p>
  
  <p>Edit->Refactor->Convert to Objective C ARC
   but getting error:</p>
  
  <p><strong>ARC forbids Objective-C objects in structs or unions</strong>.</p>
  
  <ol>
  <li>I know, i can prevent these classes to converting to ARC by adding
  -fno-objc-arc to the compiler options. but i want to convert these classes also to ARC. Is it possible?</li>
  <li>How to allow that xcode should check only some classes for ARC conversion? For example when i am converting to arc it checks the classes code, but i have some classes those are not to convert to arc. so want that Xcode should not generate error for them within conversion process. is it possible? </li>
  </ol>