3 // SourceBase will be the base class of Source.  We'll pass a Source object into a
5 // goo and all the way back to Source.
28 // Source is a class that will be observed by the Observer class below.
33 @interface Source : SourceBase  interface
37 - (Source *) init;
41 @implementation Source  implementation
42 - (Source *) init
54 @interface SourceDerived : Source
75 // Observer is the object that will watch Source and cause KVO to swizzle it...
79     Source *_source;
81 + (Observer *) observerWithSource: (Source *) source;  argument
82 - (Observer *) initWithASource: (Source *) source;  argument
91 + (Observer *) observerWithSource: (Source *) inSource;  argument
99 - (Observer *) initWithASource: (Source *) source
128     Source *mySource;