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Should we have a class for diffing?

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评估

难度
5/5
预计耗时
一周以上
新手友好度
25/100
Issue 类型
功能
描述清晰度
需要澄清
活跃度
停滞
技术栈
haskell
领域
tooling

调研方向

Start by reading the existing Patch and PatchTarget definitions and the patch types that implement them. Determine whether a shared Diff class fits those types and what tests would demonstrate the stated applyAlways law; the issue is complete only when the API decision and its scope are settled.

由索引模型根据 Issue 内容生成。

描述

From a discussion with a colleague, the following class emerged:

-- | Law: applyAlways (diff x y) x = y
class Patch p => Diff p where
  -- | @diff from to@ returns a patch which turns @from@ into @to@.
  diff :: PatchTarget p -> PatchTarget p -> p

It seems useful, even if we cannot guarantee that such a class exists for every patch type.

主要语言
Haskell
星标
17
派生
16
平均合并
9 小时 32 分钟
30 天内合并 PR
1

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从这里开始

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  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

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