Hello Brian, Thursday, January 4, 2007, 10:00:05 PM, you wrote:
> deeper, the programmer is burdened more and more by the need to > cut-and-paste method definitions between instances because Haskell doesn't > allow a superclass (or ancestor class) method default to be redefined in a > subclass. i've runned into this problem with Streams library. finally i've decided to wrote bodies of such methods outside of class: getLineBody :: (CharStream h) => h -> IO String getLineBody h = do c <- getChar .... instance LineStream File where getLine = getLineBody instance LineStream MemBuf where getLine = getLineBody where File and MemBuf, of course, are CharStream instances -- Best regards, Bulat mailto:[EMAIL PROTECTED] _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
