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  1. Proceedings of the 2013 ACM SIGPLAN symposium on Haskell (Haskell '13)
  2. Extensible effects: an alternative to monad transformers
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Proceeding

Extensible effects: an alternative to monad transformers

Content Provider ACM Digital Library
Author Swords, Cameron Kiselyov, Oleg Sabry, Amr
Abstract We design and implement a library that solves the long-standing problem of combining effects without imposing restrictions on their interactions (such as static ordering). Effects arise from interactions between a client and an effect handler (interpreter); interactions may vary throughout the program and dynamically adapt to execution conditions. Existing code that relies on monad transformers may be used with our library with minor changes, gaining efficiency over long monad stacks. In addition, our library has greater expressiveness, allowing for practical idioms that are inefficient, cumbersome, or outright impossible with monad transformers. Our alternative to a monad transformer stack is a single monad, for the coroutine-like communication of a client with its handler. Its type reflects possible requests, i.e., possible effects of a computation. To support arbitrary effects and their combinations, requests are values of an extensible union type, which allows adding and, notably, subtracting summands. Extending and, upon handling, shrinking of the union of possible requests is reflected in its type, yielding a type-and-effect system for Haskell. The library is lightweight, generalizing the extensible exception handling to other effects and accurately tracking them in types.
Starting Page 59
Ending Page 70
Page Count 12
File Format PDF
ISBN 9781450323833
DOI 10.1145/2503778.2503791
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2013-09-23
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Effect interaction Type and effect system Effect handler Monad transformer Open union Coroutine Monad
Content Type Text
Resource Type Article
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