回复： Add DList to base

[Dr.Koster]

Here's a example of Dlist in base: https://github.com/ghc/ghc/blob/master/libraries/base/GHC/Event/PSQ.hs#L468
And here is in GHC module: https://github.com/ghc/ghc/blob/ba597c1dd1daf9643b72dc7aeace8d6b3fce84eb/utils/mkUserGuidePart/DList.hs


It's so simple that people often define it with the code it's used, adding it to base can save these key stokes.


------------------ 原始邮件 ------------------
发件人: "Ivan Lazar Miljenovic";<ivan.miljenovic at gmail.com>;
发送时间: 2017年6月5日(星期一) 晚上6:21
收件人: "Dr.Koster"<drkoster at qq.com>; 
抄送: "libraries"<libraries at haskell.org>; 
主题: Re: Add DList to base



On 5 June 2017 at 17:58, Dr.Koster <drkoster at qq.com> wrote:
> Currently GHC already defined DList for internal use in serveral places.
> This data type is a nature choice when you need CPS your append, which is a
> common need. I think base should provide it.

It depends if GHC defines DList for use with base or not; if it's
something that's required to use base that _may_ be a semi-valid use
case.

In general though, as annoying as it is to have to add yet another
dependency, build, reload ghci, etc. I prefer to have base to be
smaller and packages split up and the dlist package serves admirably.
If nothing else, it can iterate faster if a new function needs to be
added.

Call this a weak +0.1(only because of GHC defining it).

-- 
Ivan Lazar Miljenovic
Ivan.Miljenovic at gmail.com
http://IvanMiljenovic.wordpress.com
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