Easy:
data ShowHex a
instance Show (ShowHex a) where
showsPrec _ (ShowHex a) = showHex a
main = putStrLn $ (show (ShowHex 27))
Here, with labelled instances you would write:
show ShowHex 27
instead you write:
show (ShowHex 27)
Keean.
George Russell wrote:
Keean Schupke wrote:
Do you need a language extension at all? You can certainly
do it with the existing extensions!
data ShowDict a
instance Show (ShowDict a) where
showsPrec _ (ShowDict a) = ...
I don't understand. How does that help you to, for example, use a
function which
requires Show Int but (say) substitute the standard function for which
which shows
in hexadecimal?
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