Don't forget that with -XOverloadedStrings we already have a IsString class.
(That's not a Haskell Prime extension though.)
class IsString a where
fromString :: String -> a
Simon
| -----Original Message-----
| From: haskell-prime-boun...@haskell.org [mailto:haskell-prime-
| boun...@haskell.org] On Behalf Of Johan Tibell
| Sent: 19 March 2012 15:54
| To: Thomas Schilling
| Cc: haskell-prime@haskell.org
| Subject: Re: String != [Char]
|
| On Mon, Mar 19, 2012 at 8:45 AM, Thomas Schilling
| <nomin...@googlemail.com> wrote:
| > Regarding the type class for converting to and from that type, there
| > is a perhaps more complicated question: The current fromString method
| > uses String as the source type which causes unnecessary overhead. This
| > is unfortunate since GHC's built-in mechanism actually uses
| > unpackCString[Utf8]# which constructs the inefficient String
| > representation from a compact memory representation. I think it would
| > be best if the new fromString/fromText class allowed an efficient
| > mechanism like that. unpackCString# has type Addr# -> [Char] which is
| > obviously GHC-specific.
|
| I've been thinking about this question as well. How about
|
| class IsString s where
| unpackCString :: Ptr Word8 -> CSize -> s
|
| It's morally equivalent of unpackCString#, but uses standard Haskell types.
|
| -- Johan
|
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