| Copyright | (c) 2011 Daniel Fischer |
|---|---|
| License | BSD3 |
| Maintainer | Daniel Fischer |
| Stability | experimental |
| Portability | non-portable (GHC extensions) |
| Safe Haskell | None |
| Language | Haskell98 |
Text.FShow.RealFloat
Description
- class FShow a where
- fshows :: FShow a => a -> ShowS
- class RealFloat a => DispFloat a where
- fshowFloat :: DispFloat a => a -> ShowS
- fshowEFloat :: DispFloat a => Maybe Int -> a -> ShowS
- fshowFFloat :: DispFloat a => Maybe Int -> a -> ShowS
- fshowGFloat :: DispFloat a => Maybe Int -> a -> ShowS
- newtype Double7 = D7 Double
- newtype FullDouble = FD {}
- newtype Float7 = F7 Float
- newtype FullFloat = FF {}
Documentation
A duplicate of the Show class.
class RealFloat a => DispFloat a where #
Class for specifying display parameters. The type a
is supposed to be an IEEE-ish (real) floating-point
type with floating-point radix 2, such that the mantissa
returned by decodeFloat satisfies
2^(binExpx) <=fst(decodeFloatx) < 2^(binExpx + 1)
for x > 0, so binExp x = floatDigits x - 1
decDigitsx = 2 +floor(floatDigitsx *logBase10 2).
The default implementation uses an approximation of
logBase 10 2
Methods
The number of decimal digits that may be needed to
uniquely determine a value of type a.
For faster conversions which need not satisfy
x ==read(fshowx)
a smaller value can be given.
The base 2 logarithm of the mantissa returned by
decodeFloat xx > 0.
fshowFloat :: DispFloat a => a -> ShowS #
fshowGFloat :: DispFloat a => Maybe Int -> a -> ShowS #
Show a signed DispFloat value
using standard decimal notation for arguments whose absolute value lies
between 0.1 and 9,999,999, and scientific notation otherwise.
In the call fshowGFloat digs valdigs is Nothing,
the value is shown to full precision; if digs is Just dmax 1 dshowGFloat
newtype FullDouble #