Download Central European Functional Programming School: 4th Summer by Johan Jeuring, Alex Gerdes, Bastiaan Heeren (auth.), PDF

By Johan Jeuring, Alex Gerdes, Bastiaan Heeren (auth.), Viktória Zsók, Zoltán Horváth, Rinus Plasmeijer (eds.)

This quantity provides the revised lecture notes of chosen talks given on the Fourth vital eu sensible Programming institution, CEFP 2011, held in June 2011 in Budapest, Hungary. The eleven revised complete papers awarded have been rigorously reviewed by way of specialists on practical programming and revised according to the experiences. The lectures disguise a variety of disbursed and multicore useful programming topics. The final 2 papers are chosen papers of the PhD Workshop equipped for the members of the summer time school.

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Extra resources for Central European Functional Programming School: 4th Summer School, CEFP 2011, Budapest, Hungary, June 14-24, 2011, Revised Selected Papers

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Jeuring, A. Gerdes, and B. Heeren Another design choice is how to represent recursive grammars, for which we use the constructors Rec and Var. A Rec binds all the Vars in its scope that have the same integer. , there are no free occurrences of variables. This datatype makes it easy to manipulate and analyse grammars. Alternative representations for recursion are higher-order fixed point functions, or nameless terms using De Bruijn indices. We use constructors such as : : and :|: for sequence and choice, respectively, instead of the combinators < > and <|> introduced earlier.

Library types and function signatures are displayed as code fragments and are displayed in a frame. Example code fragments are numbered. – All examples that are shown in these lecture notes are present in the iTask distribution under the directory Examples / CEFP2011. icl. Each such module defines a function flowsn that exports the example workflows in these lecture notes. prj project imports all section modules and their example workflows and integrates them in a single workflow application. – These lecture notes have been written to encourage you to experiment with the system.

6 Recursion One aspect we haven’t discussed yet is recursion. Recursion is used for example to specify that a user replaces all occurrences of a particular expression in a program by another expression. Recursion is specified by means of the fixedpoint operator fix, which takes as argument a function that maps a strategy to a new strategy. The language of fix is defined by: L (fix f ) = L (f (fix f )) The fix operator is mainly used in traversals over the abstract syntax tree. It is the responsibility of the user to specify meaningful fixed-points.

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