Popularity
2.1
Growing
Activity
0.0
Stable
1
1
1
Monthly Downloads: 14
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags:
Control
Latest version: v0.2.1.0
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README
shared-fields
A simple single-module library for creating lens field typeclasses in a way that allows them to be shared between modules.
By default, lens' makeFields creates a new class if it can't find a matching one in scope. This means that if you try to makeFields records in different modules without importing one module into the other, you'll get conflicting class definitions rather than a single lens which functions with both records.
module A where
data A = A { _aThing :: Bool }
deriving (Show, Read, Eq)
makeFields ''A
module B where
data B = B { _bThing :: String }
deriving (Show, Read, Eq)
makeFields ''B
module Main where
import A
import B
import Control.Lens
main = print $ A False ^. thing -- fails because there are two HasThing classes
If you use shared-fields, though:
module SharedFields where
generateField "Thing"
-- alternatively:
-- generateFields ["Thing"]
module A where
import SharedFields
data A = A { _aThing :: Bool }
deriving (Show, Read, Eq)
makeFields ''A
module B where
import SharedFields
data B = B { _bThing :: String }
deriving (Show, Read, Eq)
makeFields ''B
module Main where
import A
import B
import Control.Lens
main = print $ A False ^. thing -- works now because there's one consistent HasThing class!