GI.GLib.Structs.Once

A #GOnce struct controls a one-time initialization function. Any one-time initialization function must have its own unique #GOnce struct.

Exported types

newtype Once

Constructors

Once (ForeignPtr Once)

Instances

WrappedPtr Once

Methods

wrappedPtrCalloc :: IO (Ptr Once)

wrappedPtrCopy :: Ptr Once -> IO (Ptr Once)

wrappedPtrFree :: Maybe (FunPtr (Ptr Once -> IO ()))

(~) AttrOpTag tag AttrSet => Constructible Once tag

Methods

new :: MonadIO m => (ForeignPtr Once -> Once) -> [AttrOp Once tag] -> m Once

((~) * info (ResolveOnceMethod t Once), MethodInfo * info Once p) => IsLabel t (Once -> p)

Methods

fromLabel :: Proxy# Symbol t -> Once -> p

((~) * info (ResolveOnceMethod t Once), MethodInfo * info Once p) => IsLabelProxy t (Once -> p)

Methods

fromLabelProxy :: Proxy Symbol t -> Once -> p

type AttributeList Once

type AttributeList Once

newZeroOnce :: MonadIO m => m Once

Construct a Once struct initialized to zero.

noOnce :: Maybe Once

Methods

onceInitEnter

onceInitEnter :: MonadIO m => Ptr () -> m Bool

onceInitLeave

onceInitLeave :: MonadIO m => Ptr () -> Word64 -> m ()

Properties

Retval

onceClearRetval :: MonadIO m => Once -> m ()

onceReadRetval :: MonadIO m => Once -> m (Ptr ())

onceRetval :: AttrLabelProxy "retval"

onceWriteRetval :: MonadIO m => Once -> Ptr () -> m ()

Status

onceReadStatus :: MonadIO m => Once -> m OnceStatus

onceStatus :: AttrLabelProxy "status"

onceWriteStatus :: MonadIO m => Once -> OnceStatus -> m ()