    {-# LANGUAGE CPP               #-}
    {-# LANGUAGE OverloadedStrings #-}
    {-# OPTIONS_GHC -fno-warn-orphans #-}
    {-|
    Module:      TextShow.Functions
    Copyright:   (C) 2014-2015 Ryan Scott
    License:     BSD-style (see the file LICENSE)
    Maintainer:  Ryan Scott
    Stability:   Provisional
    Portability: GHC

    Optional 'TextShow', 'TextShow1', and 'TextShow2' instances for functions.

    /Since: 2/
    -}
    module TextShow.Functions (showbFunction) where

    import Data.Text.Lazy.Builder (Builder)
    import TextShow.Classes (TextShow(showb, showbPrec), TextShow1(..), TextShow2(..))

    #include "inline.h"

    -- | Convert a function to a 'Builder'.
    --
    -- /Since: 2/
    showbFunction :: (a -> b) -> Builder
    showbFunction = showb
    {-# INLINE showbFunction #-}

    instance TextShow (a -> b) where
        showbPrec = showbPrecWith undefined
        INLINE_INST_FUN(showbPrec)

    instance TextShow1 ((->) a) where
        showbPrecWith = showbPrecWith2 undefined
        INLINE_INST_FUN(showbPrecWith)

    instance TextShow2 (->) where
        showbPrecWith2 _ _ _ _ = "<function>"
        INLINE_INST_FUN(showbPrecWith2)