Infix expressions

[Yoann Padioleau]

Ken Shan <ken@digitas.harvard.edu> writes:

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> Hello,
> 
> In Haskell, backquotes can be used to convert individual identifiers
> into infix operators, but not complex expressions.  For example,
> 
>     [1,2,3] `zip` [4,5,6]
> 
> is OK, but not
> 
>     [1,2,3] `zipWith (+)` [4,5,6]
> 
> Is there any reason other than potential confusion when one of the two
> backquotes is accidentally omitted?
> 
> In any case, perhaps some people on this mailing list would appreciate
> the following implementation of "infix expressions" that Dylan Thurston
> and I came up with -- as algebraic and perverse as we could manage:
> 
>     infixr 0 -:, :-
>     data Infix f y =3D f :- y
>     x -:f:- y =3D x `f` y
> 
>     main =3D print $ [1,2,3] -: zipWith (+) :- [4,5,6]

This is a funny tricks.
Does some people know other kind of tricks (possibly in other functionnal langage) ?


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-- 
          Yoann  Padioleau,  INSA de Rennes, France,
Opinions expressed here are only mine. Je n'écris qu'à titre personnel.
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