Re: [Caml-list] Suggestion for overloaded operators

[Bruno Pagano <bpagano@free.fr>]

On Sun, Feb 10, 2002 at 02:04:45PM +0100, Warp wrote:
> Helo.
> One of missing thing in Ocaml is the possibility to overload the operators
> such as + - / * = (by overloading, i mean : defining such operators for
> other types than -int- )....
> Here's a syntactic proposal to enable this feature :
> 
> (a :+ b)
> The ':' is here to precise that we're using overloading , and a and b can be
> of any type. ( let's say typea and typeb )
> The compiler will seek for a function named :
>     typea_add_typeb : typea -> typeb -> typer
> and use it to implement the :+ operator. ( which have typer as result type )
> And so on...
> 
> I think such a thing cannot be done with CamlP4 - because it doesn't know
> about types - and I know that the ocaml team has lots of things to do , but
> I was thinking that can be a quite good feature for futur updates.
> 
> Warp
> 
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Hello,

  what about polymorphism ?

assume following declarations :

let (:+) x y = x + y 
let (:+) x y = x +. y

we define the overloaded operator :+  (respectively for int and for float)

what about the following declaration :

let f x y = x :+ y ;;

Is f overloaded too ?  f has not the colon symbol !
Is this declaration forbidden ? why !

I think that overloading is not compatible with type inference  ?

Bruno Pagano

PS: Perhaps, type inference is no more relevant with modules and objects
and should disappear !
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