Seems very similar, except the special case is usually used for replacing null values as a starting point.
When used to expose polymophic behaviors, the state pattern uses a "container" class to hold the state using composition, but the special case classes use sub-typing (thus the need for a factory of some kind).
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Seems very similar, except the special case is usually used for replacing
nullvalues as a starting point.When used to expose polymophic behaviors, the state pattern uses a "container" class to hold the state using composition, but the special case classes use sub-typing (thus the need for a factory of some kind).