title: Getting error while using ObjC class include in .cpp file (unqualified-id @class)
body: <p>I am working with <a href="http://www.wikitude.com/external/doc/documentation/latest/ios/setupguideios.html" rel="nofollow noreferrer">Wikitude SDK</a> and while adding some file supported in Wikitude example folder its showing me Foundation file error like below.</p>
  <blockquote>
  <p>In file included from
  /Volumes/DATA/Dhanesh/Projects/experiments/AR/ARWikiDemo/ARWikiDemo/WikiSDK/Controller/Examples/Categories/PluginsAPI/CustomCamera/YUVFrameInputPlugin.cpp:11:
  In file included from
  /Volumes/DATA/Dhanesh/Projects/experiments/AR/ARWikiDemo/ARWikiDemo/WikiSDK/Controller/Examples/Categories/PluginsAPI/CustomCamera/WTDeviceCamera.h:9:
  In file included from
  /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.3.sdk/System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:8:
  /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator10.3.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:492:1:
  error: expected unqualified-id @class NSString, Protocol;</p>
  </blockquote>
  <p>Not getting whats wrong here but it says that</p>
  <p>All <code>NSString</code>, <code>NSObject</code>, <code>NSLog</code> are <strong>unqualified-id @class</strong></p>
  <p>I have set all related Linker flag and Header &amp; Library search paths for that but still getting the above error.</p>
  <p>Can anyone guide me on this whats going wrong here?</p>
  <p><strong>Error Screenshot for reference:</strong></p>
  <p><a href="https://i.stack.imgur.com/oZdBt.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/oZdBt.png" alt="enter image description here" /></a></p>
  <p>Thanks in Advance!</p>