{-# LANGUAGE CPP               #-}
{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE UnicodeSyntax     #-}

{-|
Module     : Data.Map.Lazy.Unicode
Copyright  : 2009–2012 Roel van Dijk
License    : BSD3 (see the file LICENSE)
Maintainer : Roel van Dijk <vandijk.roel@gmail.com>
-}

module Data.Map.Lazy.Unicode
    ( (∈), (∋), (∉), (∌)
    , (∅)
    , (∪), (∖), (∆), (∩)
    ) where


-------------------------------------------------------------------------------
-- Imports
-------------------------------------------------------------------------------

-- from base:
import Data.Bool     ( Bool )
import Data.Ord      ( Ord )
import Data.Function ( flip )

-- from containers:
#ifdef CONTAINERS_OLD
#define MODULE Data.Map
#else
#define MODULE Data.Map.Lazy
#endif
import MODULE ( Map
              , member, notMember
              , empty
              , union, difference, intersection
              )
#undef MODULE

-------------------------------------------------------------------------------
-- Fixities
-------------------------------------------------------------------------------

infix  4 ∈
infix  4 ∋
infix  4 ∉
infix  4 ∌
infixl 6 ∪
infixr 6 ∩
infixl 9 ∖
infixl 9 ∆


-------------------------------------------------------------------------------
-- Symbols
-------------------------------------------------------------------------------

{-|
(&#x2208;) = 'member'

U+2208, ELEMENT OF
-}
(∈) ∷ Ord k ⇒ k → Map k α → Bool
∈ :: k -> Map k α -> Bool
(∈) = k -> Map k α -> Bool
forall k a. Ord k => k -> Map k a -> Bool
member
{-# INLINE (∈) #-}

{-|
(&#x220B;) = 'flip' (&#x2208;)

U+220B, CONTAINS AS MEMBER
-}
(∋) ∷ Ord k ⇒ Map k α → k → Bool
∋ :: Map k α -> k -> Bool
(∋) = (k -> Map k α -> Bool) -> Map k α -> k -> Bool
forall a b c. (a -> b -> c) -> b -> a -> c
flip k -> Map k α -> Bool
forall k a. Ord k => k -> Map k a -> Bool
(∈)
{-# INLINE (∋) #-}

{-|
(&#x2209;) = 'notMember'

U+2209, NOT AN ELEMENT OF
-}
(∉) ∷ Ord k ⇒ k → Map k α → Bool
∉ :: k -> Map k α -> Bool
(∉) = k -> Map k α -> Bool
forall k a. Ord k => k -> Map k a -> Bool
notMember
{-# INLINE (∉) #-}

{-|
(&#x220C;) = 'flip' (&#x2209;)

U+220C, DOES NOT CONTAIN AS MEMBER
-}
(∌) ∷ Ord k ⇒ Map k α → k → Bool
∌ :: Map k α -> k -> Bool
(∌) = (k -> Map k α -> Bool) -> Map k α -> k -> Bool
forall a b c. (a -> b -> c) -> b -> a -> c
flip k -> Map k α -> Bool
forall k a. Ord k => k -> Map k a -> Bool
(∉)
{-# INLINE (∌) #-}

{-|
(&#x2205;) = 'empty'

U+2205, EMPTY SET
-}
(∅) ∷ Map k α
∅ :: Map k α
(∅) = Map k α
forall k a. Map k a
empty
{-# INLINE (∅) #-}

{-|
(&#x222A;) = 'union'

U+222A, UNION
-}
(∪) ∷ Ord k ⇒ Map k α → Map k α → Map k α
∪ :: Map k α -> Map k α -> Map k α
(∪) = Map k α -> Map k α -> Map k α
forall k a. Ord k => Map k a -> Map k a -> Map k a
union
{-# INLINE (∪) #-}

{-|
(&#x2216;) = 'difference'

U+2216, SET MINUS
-}
(∖) ∷ Ord k ⇒ Map k α → Map k β → Map k α
∖ :: Map k α -> Map k β -> Map k α
(∖) = Map k α -> Map k β -> Map k α
forall k a b. Ord k => Map k a -> Map k b -> Map k a
difference
{-# INLINE (∖) #-}

{-|
Symmetric difference

a &#x2206; b = (a &#x2216; b) &#x222A; (b &#x2216; a)

U+2206, INCREMENT
-}
(∆) ∷ Ord k ⇒ Map k α → Map k α → Map k α
Map k α
a ∆ :: Map k α -> Map k α -> Map k α
∆ Map k α
b = (Map k α
a Map k α -> Map k α -> Map k α
forall k a b. Ord k => Map k a -> Map k b -> Map k a
∖ Map k α
b) Map k α -> Map k α -> Map k α
forall k a. Ord k => Map k a -> Map k a -> Map k a
∪ (Map k α
b Map k α -> Map k α -> Map k α
forall k a b. Ord k => Map k a -> Map k b -> Map k a
∖ Map k α
a)
{-# INLINE (∆) #-}

{-|
(&#x2229;) = 'intersection'

U+2229, INTERSECTION
-}
(∩) ∷ Ord k ⇒ Map k α → Map k β → Map k α
∩ :: Map k α -> Map k β -> Map k α
(∩) = Map k α -> Map k β -> Map k α
forall k a b. Ord k => Map k a -> Map k b -> Map k a
intersection
{-# INLINE (∩) #-}