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1. computeOverhead :: HashTable s k v -> ST s Double

   hashtables	Data.HashTable.ST.Linear

   See the documentation for this function in Data.HashTable.Class#v:computeOverhead.

2. xml_header :: String

   xml	Text.XML.Light.Output

   The XML 1.0 header

3. thead_ :: Term arg result => arg -> result

   lucid	Lucid.Html5

   thead element

4. unsafeHead :: Storable a => Vector a -> a

   storablevector	Data.StorableVector.Base

   A variety of head for non-empty Vectors. unsafeHead omits the check for the empty case, so there is an obligation on the programmer to provide a proof that the Vector is non-empty.

5. hReadEntryHeader :: Handle -> TarEntryOffset -> IO Entry

   tar	Codec.Archive.Tar.Index

   Read the header for a Entry at the given TarEntryOffset in the tar file. The entryContent will contain the correct metadata but an empty file content. The Handle must be open for reading and be seekable. The Handle position is advanced to the beginning of the entry content (if any). You must check the entryContent to see if the entry is of type NormalFile. If it is, the NormalFile gives the content length and you are free to read this much data from the Handle.

   entry <- Tar.hReadEntryHeader hnd
   case Tar.entryContent entry of
   Tar.NormalFile _ size -> do content <- BS.hGet hnd size
   ...
   

   Of course you don't have to read it all in one go (as hReadEntry does), you can use any appropriate method to read it incrementally. In addition to I/O errors, this can throw a FormatError if the offset is wrong, or if the file is not valid tar format. There is also the lower level operation hSeekEntryOffset.

6. hReadEntryHeaderOrEof :: Handle -> TarEntryOffset -> IO (Maybe (Entry, TarEntryOffset))

   tar	Codec.Archive.Tar.Index

   This is a low level variant on hReadEntryHeader, that can be used to iterate through a tar file, entry by entry. It has a few differences compared to hReadEntryHeader:

   • It returns an indication when the end of the tar file is reached.
   • It does not move the Handle position to the beginning of the entry content.
   • It returns the TarEntryOffset of the next entry.
   After this action, the Handle position is not in any useful place. If you want to skip to the next entry, take the TarEntryOffset returned and use hReadEntryHeaderOrEof again. Or if having inspected the Entry header you want to read the entry content (if it has one) then use hSeekEntryContentOffset on the original input TarEntryOffset.

7. _head :: Cons s s a a => Traversal' s a

   diagrams-lib	Diagrams.Prelude

   A Traversal reading and writing to the head of a non-empty container.

   >>> [a,b,c]^? _head
   Just a
   

   >>> [a,b,c] & _head .~ d
   [d,b,c]
   

   >>> [a,b,c] & _head %~ f
   [f a,b,c]
   

   >>> [] & _head %~ f
   []
   

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

   >>> []^?_head
   Nothing
   

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

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

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

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

   This isn't limited to lists. For instance you can also traverse the head of a Seq:

   >>> Seq.fromList [a,b,c,d] & _head %~ f
   fromList [f a,b,c,d]
   

   >>> Seq.fromList [] ^? _head
   Nothing
   

   >>> Seq.fromList [a,b,c,d] ^? _head
   Just a
   

   _head :: Traversal' [a] a
   _head :: Traversal' (Seq a) a
   _head :: Traversal' (Vector a) a
   

8. _arrowHead :: ArrowOpts n -> ArrowHT n

   diagrams-lib	Diagrams.TwoD

   No documentation available.

9. _headGap :: ArrowOpts n -> Measure n

   diagrams-lib	Diagrams.TwoD

   No documentation available.

10. _headLength :: ArrowOpts n -> Measure n

    diagrams-lib	Diagrams.TwoD

    No documentation available.

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