Safe Haskell | Safe-Infered |
---|
- class C event where
- note :: C event => Channel -> event -> Maybe (Velocity, Pitch, Bool)
- program :: C event => Channel -> event -> Maybe Program
- anyController :: C event => Channel -> event -> Maybe (Controller, Int)
- controller :: C event => Channel -> Controller -> event -> Maybe Int
- mode :: C event => Channel -> event -> Maybe T
- pitchBend :: C event => Channel -> event -> Maybe Int
- channelPressure :: C event => Channel -> event -> Maybe Int
Documentation
class C event where
All methods have default implementations that return Nothing
.
This helps implementing event data types
that support only a subset of types of events.
Maybe a better approach is to provide type classes
for every type of event
and make C
a subclass of all of them.
anyController :: C event => Channel -> event -> Maybe (Controller, Int)
controller :: C event => Channel -> Controller -> event -> Maybe Int
channelPressure :: C event => Channel -> event -> Maybe Int