Free On-line Dictionary of Computing

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年07月28日

Nearby terms:

Subset-Equational LanguageSubstitutesubstratesubtype subtypingSuccessoRsuccessor

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