data-default-instances-unordered-containers-0.0.1: src/Data/Default/Instances/UnorderedContainers.hs

{-# LANGUAGE NoImplicitPrelude #-}
{-# OPTIONS_GHC -fno-warn-orphans #-}
-- |
-- Module:       $HEADER$
-- Description:  Default instances for HashMap and HashSet.
-- Copyright:    (c) 2015, Peter Trško
-- License:      BSD3
--
-- Maintainer:   peter.trsko@gmail.com
-- Stability:    experimental
-- Portability:  NoImplicitPrelude
--
-- 'Default' instances for 'HashMap' and 'HashSet' from
-- <https://hackage.haskell.org/package/unordered-containers unordered-containers>
-- package.
module Data.Default.Instances.UnorderedContainers
    ( -- $providedInstances
    )
  where

import Data.HashMap.Strict (HashMap)
import qualified Data.HashMap.Strict as HashMap (empty)
import Data.HashSet (HashSet)
import qualified Data.HashSet as HashSet (empty)

import Data.Default.Class (Default(def))


instance Default (HashMap k v) where
    def = HashMap.empty

instance Default (HashSet a) where
    def = HashSet.empty

-- $providedInstances
--
-- Following instances are provided:
--
-- @
-- instance 'Default' ('HashMap' k v) where
--     'def' = 'HashMap.empty'
--
-- instance 'Default' ('HashSet' a) where
--     'def' = 'HashSet.empty'
-- @