This file defines the question usage class, and a few related classes. More...

Classes
class	question_attempt_iterator
	A class abstracting access to the question_usage_by_activity::$questionattempts array. More...

class	question_usage_by_activity
	This class keeps track of a group of questions that are being attempted, and which state, and so on, each one is currently in. More...

class	question_usage_null_observer
	Null implmentation of the question_usage_watcher interface. More...

interface	question_usage_observer
	Interface for things that want to be notified of signficant changes to a question_usage_by_activity. More...

Detailed Description

This file defines the question usage class, and a few related classes.

@subpackage questionengine

Classes