:: Handle -> IO a -package:envelope

IOData Wrapper for hGetContents Note: This operation uses lazy I/O. Use NFData to force all data to be read and consequently the internal file handle to be closed.

Read a fully-typed XML document from a file handle.

Reads a line from the specified handle

Read entire handle contents. May be done lazily like hGetContents.

Read n bytes *or* characters, depending on the implementation into a ByteString, directly from the specified Handle Whether or not this function is lazy depends on the instance; laziness is preferred.

Read a single line from a handle

Throw an error, escaping the current computation up to the nearest catchError (if any).

runThrow (throwError e >>= k) = runThrow (throwError e)

A higher-order generalisation of replicate. For example

foo :: IO (String, String, String)
foo = replicateT getLine

> foo
Hello
world
!
("Hello","world","!")

Use sequenceT instead. It has a better name.

A higher-order generalisation of sequenceA. For example

> sequenceT (print 3110, putStrLn World) :: IO ((), ())
3110
World
((),())

Return the value of the variable or throw an error.

storableCast works like storableCastArray, except that it takes a single value and returns a single value.