| Safe Haskell | None |
|---|---|
| Language | Haskell2010 |
LiveCoding.Migrate.NoMigration
Description
If a data type is wrapped in NoMigration then it can be used as the state of a Cell
without requiring it to have a Data instance. The consequence is that if the type has changed
in between a livereload, then the previous saved value will be discarded, and no migration attempt
will happen.
LiveCoding does not export delay and changes from this module. These functions should be
used with a qualified import.
Synopsis
- data NoMigration a
- = Initialized a
- | Uninitialized
- fromNoMigration :: a -> NoMigration a -> a
- dataTypeNoMigration :: DataType
- initializedConstr :: Constr
- uninitializedConstr :: Constr
- delay :: forall (m :: Type -> Type) a. (Monad m, Typeable a) => a -> Cell m a a
- changes :: forall a (m :: Type -> Type). (Typeable a, Eq a, Monad m) => Cell m a (Maybe a)
- arrChangesM :: (Monad m, Typeable a, Typeable b, Eq a) => (a -> m b) -> Cell m a b
- cellNoMigration :: (Typeable s, Functor m) => s -> (s -> a -> m (b, s)) -> Cell m a b
NoMigration data type and Data instance.
data NoMigration a Source #
Isomorphic to Maybe aData instance. The Data instance for NoMigration aData instance for a.
If a data type is wrapped in NoMigration then it can be used as the state of a Cell
without requiring it to have a Data instance. The consequence is that if the type has changed
in between a livereload, then the previous saved value will be discarded, and no migration attempt
will happen.
Constructors
| Initialized a | |
| Uninitialized |
Instances
| Functor NoMigration Source # | |
Defined in LiveCoding.Migrate.NoMigration Methods fmap :: (a -> b) -> NoMigration a -> NoMigration b # (<$) :: a -> NoMigration b -> NoMigration a # | |
| Foldable NoMigration Source # | |
Defined in LiveCoding.Migrate.NoMigration Methods fold :: Monoid m => NoMigration m -> m # foldMap :: Monoid m => (a -> m) -> NoMigration a -> m # foldMap' :: Monoid m => (a -> m) -> NoMigration a -> m # foldr :: (a -> b -> b) -> b -> NoMigration a -> b # foldr' :: (a -> b -> b) -> b -> NoMigration a -> b # foldl :: (b -> a -> b) -> b -> NoMigration a -> b # foldl' :: (b -> a -> b) -> b -> NoMigration a -> b # foldr1 :: (a -> a -> a) -> NoMigration a -> a # foldl1 :: (a -> a -> a) -> NoMigration a -> a # toList :: NoMigration a -> [a] # null :: NoMigration a -> Bool # length :: NoMigration a -> Int # elem :: Eq a => a -> NoMigration a -> Bool # maximum :: Ord a => NoMigration a -> a # minimum :: Ord a => NoMigration a -> a # sum :: Num a => NoMigration a -> a # product :: Num a => NoMigration a -> a # | |
| Traversable NoMigration Source # | |
Defined in LiveCoding.Migrate.NoMigration Methods traverse :: Applicative f => (a -> f b) -> NoMigration a -> f (NoMigration b) # sequenceA :: Applicative f => NoMigration (f a) -> f (NoMigration a) # mapM :: Monad m => (a -> m b) -> NoMigration a -> m (NoMigration b) # sequence :: Monad m => NoMigration (m a) -> m (NoMigration a) # | |
| Typeable a => Data (NoMigration a) Source # | The Data instance for |
Defined in LiveCoding.Migrate.NoMigration Methods gfoldl :: (forall d b. Data d => c (d -> b) -> d -> c b) -> (forall g. g -> c g) -> NoMigration a -> c (NoMigration a) # gunfold :: (forall b r. Data b => c (b -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (NoMigration a) # toConstr :: NoMigration a -> Constr # dataTypeOf :: NoMigration a -> DataType # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (NoMigration a)) # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (NoMigration a)) # gmapT :: (forall b. Data b => b -> b) -> NoMigration a -> NoMigration a # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> NoMigration a -> r # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> NoMigration a -> r # gmapQ :: (forall d. Data d => d -> u) -> NoMigration a -> [u] # gmapQi :: Int -> (forall d. Data d => d -> u) -> NoMigration a -> u # gmapM :: Monad m => (forall d. Data d => d -> m d) -> NoMigration a -> m (NoMigration a) # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> NoMigration a -> m (NoMigration a) # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> NoMigration a -> m (NoMigration a) # | |
| Show a => Show (NoMigration a) Source # | |
Defined in LiveCoding.Migrate.NoMigration Methods showsPrec :: Int -> NoMigration a -> ShowS # show :: NoMigration a -> String # showList :: [NoMigration a] -> ShowS # | |
| Eq a => Eq (NoMigration a) Source # | |
Defined in LiveCoding.Migrate.NoMigration Methods (==) :: NoMigration a -> NoMigration a -> Bool # (/=) :: NoMigration a -> NoMigration a -> Bool # | |
fromNoMigration :: a -> NoMigration a -> a Source #
Utility functions which internally use NoMigration.
changes :: forall a (m :: Type -> Type). (Typeable a, Eq a, Monad m) => Cell m a (Maybe a) Source #
Like changes, but doesn't require Data instance, and only migrates the last
value if it still is of the same type.