subtype

<programming>

If S is a subtype of T then an expression of type S may be used anywhere that one of type T can and an implicit type conversion will be applied to convert it to type T.

In object oriented programming, this means that objects of type S must accept every message that one of type T would.

Last updated: 1997-07-28

Nearby terms:

Subset-Equational LanguageSubstitutesubstratesubtypesubtypingSuccessoRsuccessor

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