Here are the classes, structs, unions and interfaces with brief descriptions:

CLayarSDK	This is the main class for Layar SDK. You use this class to configure the SDK and to construct required AR view controllers
C<LayarSDKDelegate>	The LayarSDKDelegate provides you with several callback methods to inform you and allow you to override some activities
C<LayarSDKLocationProvider>	The LayarSDKLocationProvider provides you with several callback methods that you can use to a custom location provider in the SDK
C<LayarSDKViewController>	The LayarSDKViewController gives you access to extended functionality of AR view controller, e.g. allows you to launch map view representation of layers or open layer settings screen