Central European Functional Programming School: Second by Rinus Plasmeijer, Peter Achten (auth.), Zoltán Horváth,

By Rinus Plasmeijer, Peter Achten (auth.), Zoltán Horváth, Rinus Plasmeijer, Anna Soós, Viktória Zsók (eds.)

This quantity offers 8 rigorously revised texts from chosen lectures given via prime researchers on the moment principal ecu practical Programming college, CEFP 2007, held in Cluj-Napoca, Romania, in June 2007.

The 8 revised complete papers offered have been rigorously chosen in the course of rounds of reviewing and development for inclusion within the publication. The lectures conceal a variety of subject matters comparable to interactive workflows, lazy useful courses, lambda calculus, and object-oriented sensible programming.

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Additional resources for Central European Functional Programming School: Second Summer School, CEFP 2007, Cluj-Napoca, Romania, June 23-30, 2007, Revised Selected Lectures

Example text

In both cases, the user can work on each subtask in any desired order. A subtask, like any other task, can consist of any composition of iTasks. (-&&-) infixr 4 :: (Task a) (Task b) → Task (a,b) | iCreate a & iCreate b (-&&-) taska taskb = doTask and where and tst=:{tasknr} (a,tst=:{activated=adone}) = mkParSubTask 0 tasknr taska tst (b,tst=:{activated=bdone}) = mkParSubTask 1 tasknr taskb tst = ((a,b) ,set_activated (adone && bdone) tst (-||-) infixr 3 :: (Task a) (Task a) → Task a | iCreate a (-||-) taska taskb = doTask or where or tst=:{tasknr} (a,tst=:{activated=adone}) = mkParSubTask 0 tasknr taska tst (b,tst=:{activated=bdone}) = mkParSubTask 1 tasknr taskb tst = ( if adone a ( if bdone b createDefault) , set_activated (adone || bdone) tst ) mkParSubTask :: Int TaskID (Task a) → Task a mkParSubTask i tasknr task = task o newSubTaskNr o set_activated True o subTaskNr i The function mkParSubTask is a special wrapper function for subtasks.

Hence, one has to keep in mind to regard getPositive as a task that can be recursively activated, and not as a plain recursive function. The combinator repeatTask repeats a given task, until the predicate p holds. >> editTask "Done" i) (λx → x > 0) Note the importance of the place of the newTask. e. without waiting for activation). This is generally not the desired behavior. 5 Reflection (Part II) With the combinators presented above, iTasks can be composed as desired. As discussed in Sect. 4, one can imagine all kinds of additional combinators.

Moreover, we provide higher-order tasks that can be suspended and migrated. Web applications can be structured with continuations. This has been done by Hughes, in his arrow framework [14]. Queinnec states that “A browser is a device that can invoke continuations multiply/simultaneously” [21]. Graunke et al [10] have explored continuations as one of three functional compilation techniques to transform sequential interactive programs to CGI programs. The Seaside [6] system offers an API for programming web pages using a Smalltalk interpreter.

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