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1. data HasHeader

   cassava	Data.Csv.Streaming

   Is the CSV data preceded by a header?

2. HasHeader :: HasHeader

   cassava	Data.Csv.Streaming

   The CSV data is preceded by a header

3. NoHeader :: HasHeader

   cassava	Data.Csv.Streaming

   The CSV data is not preceded by a header

4. _head :: Cons s s a a => AffineTraversal' s a

   optics-core	Optics.Cons.Core

   An AffineTraversal reading and writing to the head of a non-empty container.

   >>> "abc" ^? _head
   Just 'a'
   

   >>> "abc" & _head .~ 'd'
   "dbc"
   

   >>> [1,2,3] & _head %~ (*10)
   [10,2,3]
   

   >>> [] & _head %~ absurd
   []
   

   >>> [1,2,3] ^? _head
   Just 1
   

   >>> [] ^? _head
   Nothing
   

   >>> [1,2] ^? _head
   Just 1
   

   >>> [] & _head .~ 1
   []
   

   >>> [0] & _head .~ 2
   [2]
   

   >>> [0,1] & _head .~ 2
   [2,1]
   

5. iheadOf :: forall k (is :: IxList) i s a . (Is k A_Fold, HasSingleIndex is i) => Optic' k is s a -> s -> Maybe (i, a)

   optics-core	Optics.IxFold

   Retrieve the first entry of an IxFold along with its index.

   >>> iheadOf ifolded [1..10]
   Just (0,1)
   

6. clearQueueHead :: MonadIO m => Queue -> m ()

   gi-glib	GI.GLib.Structs.Queue

   Set the value of the “head” field to Nothing. When overloading is enabled, this is equivalent to

   clear #head
   

7. getQueueHead :: MonadIO m => Queue -> m [Ptr ()]

   gi-glib	GI.GLib.Structs.Queue

   Get the value of the “head” field. When overloading is enabled, this is equivalent to

   get queue #head
   

8. queuePeekHead :: (HasCallStack, MonadIO m) => Queue -> m (Ptr ())

   gi-glib	GI.GLib.Structs.Queue

   Returns the first element of the queue.

9. queuePopHead :: (HasCallStack, MonadIO m) => Queue -> m (Ptr ())

   gi-glib	GI.GLib.Structs.Queue

   Removes the first element of the queue and returns its data.

10. queuePushHead :: (HasCallStack, MonadIO m) => Queue -> Ptr () -> m ()

    gi-glib	GI.GLib.Structs.Queue

    Adds a new element at the head of the queue.

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