> On Sun, 9 Sep 2007, Peter Verswyvelen wrote: > > > I find it unfortunate that one can't (I guess) define custom unary > > operators in Haskell.
Incidentally, the nhc98 compiler has always permitted the definition of unary operators, as an extension to the language. (It was just more convenient to create a general mechanism for unary/prefix operators, than to code the special case for negative numbers.) The definition syntax is rather like for infix decls: infixl 6 + prefix negate 6 - -- WARNING Not standard Haskell The operator symbol (-) is bound to a function name (negate), and has a precedence just like infix operators. Regards, Malcolm _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe