超级单子:一个概念来绑定它们

J. Bracker, H. Nilsson
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引用次数: 6

摘要

Haskell中已经实现了几个流行的monad泛化。不幸的是,由于关联类型构造函数的形状与标准Haskell单接口不匹配,每个这样的实现都提供了自己的类型类和关联库函数的版本。此外,同时使用不同的一元概念可能会很麻烦,因为通常需要明确哪个概念在哪里使用。在本文中,我们介绍了超单元:一种单元概念的编码,它捕获了几种不同的泛化,以及与所有这些统一工作的单元函数标准库的一个版本。由于标准的Haskell类型推断由于其通用性而不适用于supermonad,我们的supermonad实现附带了一个语言扩展,以格拉斯哥Haskell编译器(GHC)插件的形式,它允许对supermonad进行类型推断,从而避免了手动注释的需要。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Supermonads: one notion to bind them all
Several popular generalizations of monads have been implemented in Haskell. Unfortunately, because the shape of the associated type constructors do not match the standard Haskell monad interface, each such implementation provides its own type class and versions of associated library functions. Furthermore, simultaneous use of different monadic notions can be cumbersome as it in general is necessary to be explicit about which notion is used where. In this paper we introduce supermonads: an encoding of monadic notions that captures several different generalizations along with a version of the standard library of monadic functions that work uniformly with all of them. As standard Haskell type inference does not work for supermonads due to their generality, our supermonad implementation is accompanied with a language extension, in the form of a plugin for the Glasgow Haskell Compiler (GHC), that allows type inference for supermonads, obviating the need for manual annotations.
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