Investigate the MetaObject Protocol (MOP), which underlies the Common Lisp Object System. How does it compare to the reflection mechanisms of Java and C#? What does it allow you to do that these other...

Investigate the MetaObject Protocol (MOP), which underlies the Common Lisp Object System. How does it compare to the reflection mechanisms of Java and C#? What does it allow you to do that these other languages do not? When using a symbolic debugger and moving through a program with breakpoints, one often discovers that one has gone “too far,” and must start the program over from the beginning. This may mean losing all the effort that had been put into reaching a particular point. Consider what it would take to be able to run the program not only forward but backward as well. Such a reverse execution facility might allow the user to narrow in on the source of bugs much as one narrows the range in binary search. Consider both the loss of information that happens when data is overridden and the nondeterminism that arises in parallel and event-driven programs.