I call this operator <?>, because I often use it like so:

List.map (List.nth <?> 3) myList;;

Sadly, at toplevel <?> makes you lots of pretty '_a that restrict your 
future actions.  See my next post for questions about '_a.

Mike

On Jan 26, 2005, at 11:00 AM, Alex Baretta wrote:

> Jacques Garrigue wrote:
>> From: Radu Grigore <radugrigore@gmail.com>
>
>> If you respect this convention, the type tells you about the semantics
>> :-)
>
> There are two different patterns for function signatures: the Hashtbl 
> pattern and the Map pattern. Both are "good", depending on the 
> context. Since I need both approaches I have come up with a little 
> trick to get the best of both worlds.
>
> # let (~%) f = fun x y -> f y x
>
> The ~% operator swaps the first and the second parameter in a function 
> call. The following is a trivial example of its use.
>
> # ~% Printf.kprintf "Hello %s!" failwith "World";;
> Exception: Failure "Hello World!".
>
> Alex
>
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