Trends in Functional Programming by Hans-Wolfgang Loidl

By Hans-Wolfgang Loidl

This ebook offers most recent study advancements within the region of practical programming. The contributions, during this quantity, conceal a variety of subject matters from thought, formal points of useful programming, photographs and visible programming to disbursed computing and compiler layout. As is frequently the case during this group, the main prolific paintings comes out of the mix of theoretical paintings with its software on classical difficulties in machine technology. specific traits during this quantity are: reasoning approximately practical courses; computerized theorem proving for high-level programming languages; and, language aid for concurrency and distribution. The "TFP" sequence is devoted to selling new examine instructions concerning the sector of useful programming and to enquire the relationships of practical programming with different branches of machine technology. it's designed to be a platform for novel and upcoming study.

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The plan of this section follows this picture bottom up and from left to right. For lack of place, we cannot explain and show all the development, so we give only fragments of species. fr. basic object Let us first build from scratch a species called basic object as the root of the hierarchy. species basic_object = rep; sig parse : string -> self; sig print : self -> string; end setoid Species can also be built by inheritance. For instance, let us write the species setoid that describes the notion of setoid, a set equipped with a binary relation equal which is reflexive, symmetric and transitive.

7 RELATED WORK FOCAL proposes a rather original way of using object-oriented features, modularity and dependent types. There are a lot of proposals and languages which combine more or less these three features, for instance modules, mixins, classes, EML (extended ML). Except in Coq [Chr03], modules do not mix code, specifications and proofs. Several languages propose functors to use modules as parameters of other modules. They can mimic some kind of inheritance, but it is quite poor and we lose readability.

Equal. The species contains the proof of the theorem different not equal given as a Coq proof script (in italics). We do not go into details on the proof, we just emphasize that the names of the methods are qualified by abst (when the method is only declared) or by species names. 5. Before giving the proof script, the programmer has to be precise about the dependencies of the theorem: there is a def-dependence of m upon m’ if the former uses the type and the definition of the latter. On the other hand, when a method m only requires the type of another method m’, we say that m decl-depends upon m’.

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