Download Generic Programming: IFIP TC2 / WG2.1 Working Conference by Thorsten Altenkirch, Conor Mcbride (auth.), Jeremy Gibbons, PDF

By Thorsten Altenkirch, Conor Mcbride (auth.), Jeremy Gibbons, Johan Jeuring (eds.)

Generic programming is set making courses extra adaptable by means of making them extra basic. standard courses usually embrace non-traditional varieties of polymorphism; traditional courses are received from them through definitely instantiating their parameters. by contrast with common courses, the parameters of a usual software are usually fairly wealthy in constitution; for instance, they are different courses, forms or variety constructors, classification hierarchies, or perhaps programming paradigms.

Generic programming options have consistently been of curiosity, either to practitioners and to theoreticians, yet just recently have prevalent programming innovations turn into a particular concentration of analysis within the practical and object-oriented programming language groups.

Generic Programming contains the edited lawsuits of the operating convention on customary Programming, which used to be backed via the overseas Federation for info Processing (IFIP) and held in Dagstuhl, Germany in July 2002. With contributions from best researchers worldwide, this quantity captures the cutting-edge during this very important rising quarter.

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Read or Download Generic Programming: IFIP TC2 / WG2.1 Working Conference Programming July 11–12, 2002, Dagstuhl, Germany PDF

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Generic Programming: IFIP TC2 / WG2.1 Working Conference Programming July 11–12, 2002, Dagstuhl, Germany

Favourite programming is ready making courses extra adaptable through making them extra basic. common courses frequently embrace non-traditional forms of polymorphism; traditional courses are received from them through certainly instantiating their parameters. by contrast with general courses, the parameters of a familiar software are frequently particularly wealthy in constitution; for instance, they're different courses, varieties or variety constructors, classification hierarchies, or perhaps programming paradigms.

Extra info for Generic Programming: IFIP TC2 / WG2.1 Working Conference Programming July 11–12, 2002, Dagstuhl, Germany

Sample text

For instance, the Eq and Ord type classes can be replaced by generic equality and ordering functions that can be applied to all types. Similarly, Functor can be replaced by the gmap function. Now, there are quite a number of useful functions that Clarke and Loh 38 are usually implemented as ad-hoc polymorphic functions referring to one of these classes. An example from the Haskell prelude is lookup ·· (Eq a)=? , Maybe b Nothing Just y glookup(a) key xys Compilation. 3. A specialisation to a type expression cannot always be reduced to a set of specialisations on named types only.

Polynomial functors We consider datatypes with signatures given by so-called polynomial functors. The following is an inductive definition of this class of functors: F ::=I I An I nr I X I + I F(F, ... 'F) I : e --. e stands for the identity functor. An : en --. e denotes the n-ary constant functor, which maps n-tuples of objects to the object A; when n = 1 we simply write A. en --. e (with n ~ 2) denotes the i-th projection functor from a n-ary product category. F(G 1 , ... , Gn) (or F(Gi) for short) denotes the composition ofF : en ---; e with the nr : 52 Pardo functors G1, .

Using these constructor cases a generic function can have special cases to deal with the constructors requiring special treatment. Again we illustrate with examples. 33 Generic Haskell, Specifically Our first example uses a copy line to extend the function for collecting term variables with a constructor case for both the Let and Lambda constructors of the Expr datatype to take account of variable scoping: freecollect(t :: /'i,) ·· VarCollect((/'i,)) t termcollect (c) freecollect (c) freecollect ( case Lambda ) (Lambda ( v, t) e) = filter (:f- v) (Jreecollect(Expr) e) freecollect ( case Let ) (Let ( v, t) e e') = freecollect(Expr) e filter (:f- v) (Jreecollect ( Expr) e') .

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