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出典:『Wikipedia』 (2011/03/02 23:57 UTC 版)

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In the area of mathematical logic and computer science known as type theory, a type constructor is a feature of a typed formal language that builds new types from old. Typical type constructors encountered are product types, function types, power types and list types. Basic types are considered nullary type constructors. New types can be defined by recursively composing type constructors.