Modular type classes

14 years 6 months ago
Modular type classes
ML modules and Haskell type classes have proven to be highly effective tools for program structuring. Modules emphasize explicit configuration of program components and the use of data abstraction. Type classes emphasize implicit program construction and ad hoc polymorphism. In this paper, we show how the implicitlytyped style of type class programming may be supported within the framework of an explicitly-typed module language by viewing type classes as a particular mode of use of modules. This view offers a harmonious integration of modules and type classes, where type class features, such as class hierarchies and associated types, arise naturally as uses of existing module-language constructs, such as module hierarchies and type components. In addition, programmers have explicit control over which type class instances are available for use by type inference in a given scope. We formalize our approach as a Harper-Stone-style elaboration relation, and provide a sound type inference a...
Derek Dreyer, Robert Harper, Manuel M. T. Chakrava
Added 03 Dec 2009
Updated 03 Dec 2009
Type Conference
Year 2007
Where POPL
Authors Derek Dreyer, Robert Harper, Manuel M. T. Chakravarty, Gabriele Keller
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