Music.Pitch.Alterable

Alterable class

class Alterable a where

Class of things that can be altered.

accidental (sharpen a) = sharpen (accidental a)
accidental (flatten a) = flatten (accidental a)
sharpen . flatten      = id

Methods

sharpen :: a -> a

Increase the given pitch by one.

flatten :: a -> a

Decrease the given pitch by one.

Instances

Alterable Double

Alterable Integer

Alterable a => Alterable [a]

Integral a => Alterable (Ratio a)

Alterable a => Alterable (b -> a)

Alterable a => Alterable (b, a)

alter :: Alterable a => Int -> a -> a