foldFor -package:containers

foldForward :: FromRow r => Cursor -> Int -> (a -> r -> IO a) -> a -> IO (Either a a)

postgresql-simple Database.PostgreSQL.Simple.Cursor

Fold over a chunk of rows, calling the supplied fold-like function on each row as it is received. In case the cursor is exhausted, a Left value is returned, otherwise a Right value is returned.

foldForwardWithParser :: Cursor -> RowParser r -> Int -> (a -> r -> IO a) -> a -> IO (Either a a)

postgresql-simple Database.PostgreSQL.Simple.Cursor

Fold over a chunk of rows from the given cursor, calling the supplied fold-like function on each row as it is received. In case the cursor is exhausted, a Left value is returned, otherwise a Right value is returned.

foldForward :: Cursor haskells -> Int -> (a -> haskells -> IO a) -> a -> IO (Either a a)

opaleye Opaleye.Internal.RunQueryExternal

foldForward :: Cursor haskells -> Int -> (a -> haskells -> IO a) -> a -> IO (Either a a)

opaleye Opaleye.RunSelect

Fold over a chunk of rows, calling the supplied fold-like function on each row as it is received. In case the cursor is exhausted, a Left value is returned, otherwise a Right value is returned.

foldForestCursor :: ([CTree b] -> TreeCursor a b -> [CTree b] -> c) -> ForestCursor a b -> c

cursor Cursor.Forest

unfoldForest :: Monad m => (a -> [a]) -> a -> [TreeT m a]

hedgehog Hedgehog.Internal.Tree

Create a forest from a value and an unfolding function.