Copyright	(c) Justus Sagemüller 2017
License	GPL v3
Maintainer	(@) jsagemue $ uni-koeln.de
Stability	experimental
Portability	portable
Safe Haskell	None
Language	Haskell2010

Text.Show.Pragmatic

Description

Synopsis

Documentation

class Show a where Source

A drop-in replacement for Show. The behaviour is mostly the same: the result of show should be valid Haskell code, and reading back such a value should give the original value – but, unlike in Show, we don't require this in an exact sense, i.e. read (show x) == x is not necessarily fulfilled.

Notably for floating-point values, we allow a slight deviation if it considerably shortens the shown representation: for example, 0.90000004 :: Float, which can easily come up as the result of a computation which should in principle be exactly 0.9, is shown as 0.9 instead. We do however not commit to any particular fixed precision; it depends on the type and the order of magnitude which amount of rounding is appropriate. See the test suite for some examples.

Minimal complete definition

showsPrec | show

Methods

showsPrec :: Int -> a -> ShowS Source

show :: a -> String Source

showList :: [a] -> ShowS Source

Instances

Show Bool Source
Show Char Source
Show Double Source
Show Float Source
Show Int Source
Show Int8 Source
Show Int16 Source
Show Int32 Source
Show Int64 Source
Show Integer Source
Show Ordering Source
Show Word Source
Show Word8 Source
Show Word16 Source
Show Word32 Source
Show Word64 Source
Show () Source
Show Void Source
Show Natural Source
Show DataType Source
Show Constr Source
Show DataRep Source
Show ConstrRep Source
Show Fixity Source
Show Version Source
Show HandlePosn Source
Show FdKey Source
Show Event Source
Show Lifetime Source
Show IOMode Source
Show PatternMatchFail Source
Show RecSelError Source
Show RecConError Source
Show RecUpdError Source
Show NoMethodError Source
Show NonTermination Source
Show NestedAtomically Source
Show ThreadId Source
Show BlockReason Source
Show ThreadStatus Source
Show CodingFailureMode Source
Show CDev Source
Show CIno Source
Show CMode Source
Show COff Source
Show CPid Source
Show CSsize Source
Show CGid Source
Show CNlink Source
Show CUid Source
Show CCc Source
Show CSpeed Source
Show CTcflag Source
Show CRLim Source
Show Fd Source
Show BlockedIndefinitelyOnMVar Source
Show BlockedIndefinitelyOnSTM Source
Show Deadlock Source
Show AllocationLimitExceeded Source
Show AssertionFailed Source
Show SomeAsyncException Source
Show AsyncException Source
Show ArrayException Source
Show ExitCode Source
Show IOErrorType Source
Show Handle Source
Show BufferMode Source
Show Newline Source
Show NewlineMode Source
Show SeekMode Source
Show TextEncoding Source
Show CodingProgress Source
Show WordPtr Source
Show IntPtr Source
Show CChar Source
Show CSChar Source
Show CUChar Source
Show CShort Source
Show CUShort Source
Show CInt Source
Show CUInt Source
Show CLong Source
Show CULong Source
Show CLLong Source
Show CULLong Source
Show CFloat Source
Show CDouble Source
Show CPtrdiff Source
Show CSize Source
Show CWchar Source
Show CSigAtomic Source
Show CClock Source
Show CTime Source
Show CUSeconds Source
Show CSUSeconds Source
Show CIntPtr Source
Show CUIntPtr Source
Show CIntMax Source
Show CUIntMax Source
Show Dynamic Source
Show MaskingState Source
Show IOException Source
Show ErrorCall Source
Show ArithException Source
Show All Source
Show Any Source
Show Fingerprint Source
Show GeneralCategory Source
Show Lexeme Source
Show Number Source
Show SomeException Source
Show a => Show [a] Source
(Integral i, Show i) => Show (Ratio i) Source
(Show a, Show b) => Show (a, b) Source
(Show a, Show b, Show c) => Show (a, b, c) Source
(Show a, Show b, Show c, Show d) => Show (a, b, c, d) Source

shows :: Show a => a -> ShowS Source

ltdPrecShowsPrec :: RealFloat n => Int -> Int -> n -> ShowS Source

ltdPrecShowsPrec prcn displays floating-point values with a precision of at least prcn digits. That does not mean it will necessarily display that many digits, rather it tries to always choose the shortest representation with the required precision.

print :: Show a => a -> IO () Source

Drop-in for the standard screen-displaying function. This is useful as a GHCi evaluation action; invoke with $ ghci -interactive-print=Text.Show.Pragmatic.print to get more concise output from the REPL.