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[Frama-c-discuss] YASE \lambda

  • Subject: [Frama-c-discuss] YASE \lambda
  • From: Claude.Marche at inria.fr (Claude Marché)
  • Date: Fri Oct 17 14:35:31 2008
  • In-reply-to: <7F05BC16996C4385A9D53409E98E9488@AHARDPLACE>
  • References: <7F05BC16996C4385A9D53409E98E9488@AHARDPLACE>

Unfortunately, this feature is not expected to be available in the next 
release. Indeed neither \lambda nor \sum. The only thing we can propose 
is a work-around, for providing an ad-hoc (e.g specific for each 
example) equivalent specification.

- Claude

Christoph Weber wrote:
> Salut,
> 
> I'm thinking about some stuff I found in the acsl1_3 manual. I encountered \lambda, it seems comfortable so I wonder will following example work in the next release?
> 
> /*@
>  requires last > first;
>  requires \valid_range(first, 0, last-first -1);
>  ensures  \result == \sum(0, last-first -1,(\lambda integer k ; first[k] == value ? 1 : 0)); 
> 
> */
> int count_int_array ( int* first, int* last, int value )
> {
>   int ret=0;
>   //@ ghost int* a = first;
>     /*@
>      loop invariant a <= first <= last;
>      loop invariant ret == \sum(0, first-a-1,(\lambda integer k ; first[k] == value ? 1 : 0));
>     */
>   while (first != last) if (*first++ == value) ++ret;
>   return ret;
> }
> 
> Merci d'avance
> 
> Christoph
> 
> 
> 
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Claude March?                          | tel: +33 1 72 92 59 69
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