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matchable-th: Generates Matchable instances using TemplateHaskell

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This package provides TemplateHaskell function to generate instances of Matchable and Bimatchable type classes, which are from "matchable" package.

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Versions [RSS] 0.1.0.0, 0.1.1.0, 0.1.1.1, 0.1.2.0, 0.1.2.1, 0.2, 0.2.1
Change log CHANGELOG.md
Dependencies base (>=4.10 && <5), bifunctors (>=5.1), matchable (>=0.1.2), template-haskell (>=2.4 && <2.24), th-abstraction (>=0.4.0.0) [details]
Tested with ghc ==9.2.8, ghc ==9.4.8, ghc ==9.6.6, ghc ==9.8.2, ghc ==9.10.1
License BSD-3-Clause
Author Koji Miyazato
Maintainer viercc@gmail.com
Category Functors
Source repo head: git clone https://github.com/viercc/matchable -b master
Uploaded by viercc at 2024-12-21T08:18:54Z
Distributions NixOS:0.2
Downloads 1244 total (13 in the last 30 days)
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Status Docs available [build log]
Last success reported on 2024-12-21 [all 1 reports]

Readme for matchable-th-0.2.1

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matchable-th

This package provides TemplateHaskell functions to generate instances of Matchable and Bimatchable type classes, which are from matchable package.

Examples

{-# LANGUAGE DeriveFunctor #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE TemplateHaskell #-}

import Data.Functor.Classes (Eq1(..))
import Data.Matchable
import Data.Matchable.TH ( deriveInstances )

newtype G a = G [(a, Int, a)]
  deriving (Show, Eq, Functor)

deriveInstances [d|
  deriving instance Eq1 G
  deriving instance Matchable G
  |]


{-# LANGUAGE DeriveFunctor #-}
{-# LANGUAGE StandaloneDeriving #-}
{-# LANGUAGE TemplateHaskell #-}

import Data.Functor.Classes ( Eq1, Eq2 )
import Data.Bifunctor ( Bifunctor(..) )
import Data.Bimatchable ( Bimatchable )
import Data.Matchable ( Matchable )
import Data.Matchable.TH ( deriveInstances )

-- Test case for using [], tuple, and another Bimatchable instance
data BiG a b = BiG0 | BiG1 [a] [b] | BiG2 (Int, BiF a b)
  deriving (Show, Eq, Functor)

deriveInstances [d|
  deriving instance Bifunctor BiG
  deriving instance Eq a => Eq1 (BiG a)
  deriving instance Eq a => Matchable (BiG a)
  deriving instance Eq2 BiG
  deriving instance Bimatchable BiG
  |]