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It is said here
http://msdn.microsoft.com/en-us/library/ee817669.aspx#observerpattern_topic3a
This permits a subject to notify a
potentially infinite number of
observers of state changes, rather
than just one.
Why can’t I just use
list<Observer>
in the subject class instead of delegating to a container ?
Your
list<Observer>collection is the container that the article refers to. It is an implementation detail whether you chose a list, a map, a set, etc. to hold the set ofObservers. It really is up to you what to use. The pattern won’t change depending on the type of container used.