Database.LevelDB.Internal

Types

data DB

Database handle

Constructors

DB LevelDBPtr Options' (IORef Bool)

Instances

Eq DB

Methods

(==) :: DB -> DB -> Bool

(/=) :: DB -> DB -> Bool

data Comparator'

Internal representation of a Comparator

data FilterPolicy'

Internal representation of a FilterPolicy

data Options'

Internal representation of the Options

Constructors

Options'

Fields

• _optsPtr :: !OptionsPtr
• _cachePtr :: !(Maybe CachePtr)
• _comp :: !(Maybe Comparator')
• _fpPtr :: !(Maybe (Either FilterPolicyPtr FilterPolicy'))

unsafeClose :: DB -> IO ()

Closes the database.

The function is safe in that it doesn't double-free the pointer, but is unsafe because other functions which use the DB handle do not check if the handle is live. If the handle is used after it was freed, the program will segfault (internally, leveldb performs a delete on the pointer).

"Smart" constructors and deconstructors

freeCReadOpts :: ReadOptionsPtr -> IO ()

freeComparator :: Comparator' -> IO ()

freeFilterPolicy :: FilterPolicy' -> IO ()

freeOpts :: Options' -> IO ()

mkCReadOpts :: ReadOptions -> IO ReadOptionsPtr

mkComparator :: String -> (ByteString -> ByteString -> Ordering) -> IO Comparator'

mkCompareFun :: (ByteString -> ByteString -> Ordering) -> CompareFun

mkCreateFilterFun :: ([ByteString] -> ByteString) -> CreateFilterFun

mkFilterPolicy :: FilterPolicy -> IO FilterPolicy'

mkKeyMayMatchFun :: (ByteString -> ByteString -> Bool) -> KeyMayMatchFun

mkOpts :: Options -> IO Options'

combinators

withCWriteOpts :: WriteOptions -> (WriteOptionsPtr -> IO a) -> IO a

withCReadOpts :: ReadOptions -> (ReadOptionsPtr -> IO a) -> IO a

Utilities

throwIfErr :: String -> (ErrPtr -> IO a) -> IO a

cSizeToInt :: CSize -> Int

intToCSize :: Int -> CSize

intToCInt :: Int -> CInt

cIntToInt :: CInt -> Int

boolToNum :: Num b => Bool -> b