meaning of type class

1. type class A set of types for which certain operations or methods are defined. E. g. the class Number might have methods for additio and subtraction. Classes are a feature of object oriented languages and of the functional programming language Haskell. See also inheritance. typed lambda-calculus TLC A variety of lambda-calculus in which every term is labelled with a type. A function application A B is only synctactically valid if A has type s --> t, where the type of B is s or an instance or s in a polymorphic language and t is any type. If the types allowed for terms are restricted, e. g. to Hindley-Milner types then no term may be applied to itself, thus avoiding one kind of non-terminating evaluation. Most functional programming languages, e. g. Haskell, ML, are closely based on variants of the typed lambda-calculus.

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