Download Trends in Functional Programming: 15th International by Jurriaan Hage, Jay McCarthy PDF

By Jurriaan Hage, Jay McCarthy

This booklet constitutes the completely refereed revised chosen papers of the fifteenth overseas Symposium on developments in sensible Programming, TFP 2014, held in Soesterberg, The Netherlands, in might 2014. The eight revised complete papers integrated during this quantity have been rigorously and chosen from 22 submissions. TFP is a global discussion board for researchers with pursuits in all facets of sensible programming, taking a extensive view of present and destiny traits within the area.

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Read or Download Trends in Functional Programming: 15th International Symposium, TFP 2014, Soesterberg, The Netherlands, May 26-28, 2014. Revised Selected Papers PDF

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Extra resources for Trends in Functional Programming: 15th International Symposium, TFP 2014, Soesterberg, The Netherlands, May 26-28, 2014. Revised Selected Papers

Example text

Although the implementation works on GHC’s typed intermediate language Core, types are not relevant for the analysis itself, so we consider an untyped calculus. Also, data type constructors and pattern matching play no role here and we use e ? e1 : e2 as a simple representative for more complicated case constructs. We assume that all bound variables are distinct and do not hold us up with naming issues. Like Core we distinguish between the non-recursive let and the (possibly mutually recursive) letrec.

R (a + x) else r in go 42 0. Without Call Arity, this is the final code, and as such quite inefficient: The recursive loop go has become a function that takes one argument, then allocates a function closure for r on the heap, and finally returns another heap-allocated function closure which will pop the next argument from the stack – not the fastest way to evaluate a simple program. With Call Arity the compiler detects that go and r can both be eta-expanded with another argument, yielding the code let go = λx a.

More generally, a function can update the available effects, depending on its output. For example, a program which attempts to open a file in a particular mode (Read or Write) has the following type: open : String -> (m : Mode) -> { [FILE_IO ()] ==> Resource-Dependent Algebraic Effects 21 {ok} [FILE_IO (if ok then OpenFile m else ())] } Eff Bool The FILE IO effect carries the current state of a file handle. e. no file handle is carried in its resource). , open returns True and hence ok is True) then a file handle is available, otherwise it is not.

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