Haskell称之为Hom Functor / Monad是什么？ [英] What does Haskell call the Hom Functor/Monad?

问题描述

我想在我的代码中使用它，并且不想复制它，但由于它只涉及大量通用的单词，如function或composition，所以我无法通过搜索找到它。

I'd like to use it in my code and would rather not duplicate it, but since it involves only massively generic words like "function" or "composition" I can't find it by searching.

具体而言，我在寻找

To be completely specific, I'm looking for

instance Functor (x->) where
    fmap f p = f . p

推荐答案

这是基本的读者（或环境）monad ，通常被称为（（ - >）e）。 （这是（e - >）写成部分应用的函数，而不是作为一个部分;后面的语法有问题需要解析。）你可以通过导入 Control.Monad.Reader 或 Control.Monad.Instances 。

This is the basic reader (or environment) monad, usually referred to as ((->) e). (This is (e ->) written as a partially applied function instead of as a section; the latter syntax is problematic to parse.) You can get it by importing Control.Monad.Reader or Control.Monad.Instances.

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