Re: [Haskell-cafe] overloaded list literals?

6 Sep 2010

      On Sep 6, 2010, at 12:23 PM, Johannes Waldmann wrote:
...
We have overloaded numerical literals (Num.fromInteger)
and we can overload string literals (IsString.fromString),
so how about using list syntax ( [], : )
for anything list-like (e.g., Data.Sequence)?
As lists of some type A represent the free monoid over A, what if

     [x,y,z]

would be syntactic sugar for

     mconcat (map point (x:y:z:[]))

with

     class Pointed p where point :: a -> p a

Then list literals could be used for every pointed monoid.

Note that this only considers list literals. The (:) and []  
constructors would not be overloaded.

Sebastian

-- 
Underestimating the novelty of the future is a time-honored tradition.
(D.G.)

Re: [Haskell-cafe] overloaded list literals?

Sebastian Fischer