Popularity
3.9
Declining
Activity
0.0
Stable
5
4
0
Monthly Downloads: 14
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
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README
This module is a drop in replacement for 'Maybe'. It generalizes the functions to any types that share the same "sum of products" view of 'Maybe'.
To use the module for your type, enable GHC's DeriveGeneric extension and derive a Generic instance for your type.
{-# LANGUAGE DeriveGeneric #-}
import GHC.Generics
data Result a = Success a | Fail
deriving (Show, Generic)
After which you can use the functions, like your type was 'Maybe'
λ> fromMaybe 'a' Fail
'a'
λ> fromMaybe 'a' $ Success 'b'
'b'