Re: [Caml-list] Assert fail in partial application

["Basile Starynkevitch [local]" <basile.starynkevitch@inria.fr>]

Hello All,

On Thu, Jun 10, 2004 at 10:43:06AM +0200, Diego Olivier Fernandez Pons wrote:
> 
> I would like a function that contains an assert to fail in partial
> application and the test are still removed when compiling in noassert
> mode
> 
> # let f = fun x y -> assert (x > 0); assert (y > 0); x + y
> val f : int -> int -> int
> # f 0;;
> - : int -> int = <fun>
> # f 0 0;;
> Exception: Assert_failure (" ", 1, 19).
> 

assert is only a syntactical sugar for if <asserted-condition> then ()
else raise Assert_failure (<sourcefileposition>)

You might try to code

let f = fun x -> 
     begin 
       assert(x>0);
       fun y -> begin
         assert(y>0);
         x + y
       end
     end;;


# f 0;;
Exception: Assert_failure ("", 4, 7).
# f 1;;
- : int -> int = <fun>
# f 1 2;;
- : int = 3
# f 1 0;;
Exception: Assert_failure ("", 6, 9).

Assert has nothing magic (except that it passes the file position to
the Assert+failure exception). It could be implemented as a camlp4
macro.


Regards.
-- 
Basile STARYNKEVITCH -- basile dot starynkevitch at inria dot fr
Project cristal.inria.fr - (temporarily)
http://cristal.inria.fr/~starynke --- all opinions are only mine 

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