Using interface

similar to Interface in Java and protocol in Object-C, ZFFramework has ZFInterface for interface types
to declare a ZFInterface:

zfinterface MyInterface : zfextend ZFInterface {
    ZFINTERFACE_DECLARE(MyInterface, ZFInterface)
};
 
// in cpp files
ZFOBJECT_REGISTER(MyInterface)

• use zfinterface to show it's an ZFInterface type
• due to some limitatation, all interface type must be inherited from ZFInterface by "zfextend ZFInterface"
• use ZFINTERFACE_DECLARE for necessary macro expansion
• similar to ZFObject, use ZFOBJECT_REGISTER to register your interface if you want it to be reflectable

once declared, an interface can be implemented by other object

zfclass MyObject : zfextend ParentObject
                 , zfimplement MyInterface,
                 , zfimplement AnotherInterface
{
    ZFOBJECT_DECLARE(MyObject, ParentObject)
    ZFIMPLEMENT_DECLARE(MyInterface, AnotherInterface)
};

• use zfimplement to implement an interface
• use ZFIMPLEMENT_DECLARE for necessary macro expansion, an object can implement more than one interfaces