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7mind/no-more-orphans

Companion repository for 'No More Orphans'
Source code at GitHub https://blog.7mind.io/no-more-orphans.html
7mind/no-more-orphans.json
{
  "createdAt": "2019-04-25T12:46:44Z",
  "defaultBranch": "develop",
  "description": "Companion repository for 'No More Orphans'",
  "fullName": "7mind/no-more-orphans",
  "homepage": "https://blog.7mind.io/no-more-orphans.html",
  "language": "Scala",
  "name": "no-more-orphans",
  "pushedAt": "2022-10-13T19:40:44Z",
  "stargazersCount": 14,
  "topics": [
    "blog",
    "implicits",
    "orphans",
    "scala",
    "typeclasses"
  ],
  "updatedAt": "2023-04-28T13:40:53Z",
  "url": "https://github.com/7mind/no-more-orphans"
}

No More Orphans

Section titled “No More Orphans”

This is a sample project that defines a couple optional typeclass instances using No More Orphans trick. More details are in the accompanying blog post.

Use SBT to run the test suite:

git clone https://github.com/7mind/no-more-orphans.git
cd no-more-orphans
sbt test

Tested on Scala 2.12.12, 2.13.3, 2.11.12 (2.11 only works partially) and dotty

Addendum: the pattern may not work for non-higher-kinded types on Scala 2 (i.e. plain types like Int, not type constructors like List[_] or typeclasses like Monad[_[_]]).