[Haskell-cafe] Numeric vs. relative precedences of infix operators
benjamin.franksen at bessy.de
Tue Mar 1 21:03:18 EST 2005
On Tuesday 01 March 2005 15:28, Henning Thielemann wrote:
> On Mon, 28 Feb 2005 ajb at spamcop.net wrote:
> > G'day all.
> > Quoting karczma at info.unicaen.fr:
> > > "Widely accepted" is a widely accepted relativism...
> > > I am also annoyed by the precedences 0,1,2, ...,9, etc.
> > >
> > > Why not 10, 20, 30,... ??
> > I _think_ we had this back around Haskell 1.1 (which I never used, but
> > early Gofers also had it). Moreover, operators could also have arbitrary
> > "fixity" (prefix, infix, postfix).
> > I'm not sure why this feature was dropped,
> Because of readability I don't plead for arbitrary "fixities", I think the
> current solution of infix operators in Haskell is enough. There is really
> no advantage of "n !" over "faculty n".
There is a good argument for 'distfix' i.e. bracketing operators, IMO. You
could define your own if_then_else:
`if cond `then` truebranch `else` falsebranch end`
(Syntax, terminology, and example stolen from "Macros and Preprocessing in
Haskell", (1999) by Keith Wansbrough, see
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