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# [Frama-c-discuss] How to use a predicate with OCaml code but not by hand?

• Subject: [Frama-c-discuss] How to use a predicate with OCaml code but not by hand?
• From: njucslzh0714 at gmail.com (刘自恒)
• Date: Fri, 7 Oct 2011 23:09:32 +0800

```Hi,

First, an example as below:

/*@
predicate is_valid_int_range(int* p, int n) =
(0 <= n) && \valid_range(p,0,n-1);

lemma foo: \forall int* p,n; is_valid_int_range(p,n) <==>
\valid_range(p,0,n-1);

*/

/*@
requires is_valid_int_range(a, n);
requires is_valid_int_range(b, n);

assigns \nothing;

behavior all_equal:
assumes \forall int i; 0 <= i < n ==> a[i] == b[i];
ensures \result == 1;

behavior some_not_equal:
assumes \exists int i; 0 <= i < n && a[i] != b[i];
ensures \result == 0;

complete behaviors all_equal, some_not_equal;
disjoint behaviors all_equal, some_not_equal;
*/
int equal(const int* a, int n, const int* b)
{
for (int i = 0; i < n; i++)
if (a[i] == b[i])
{
count = count + 1;
}

return count;
}

Now how can I use the predicate "is_valid_int_range" with OCaml code but not
by hand if it is pre-defined somewhere? That is the annotations such as
"requires is_valid_int_range(a, n);" can be generated automatically. Its
name and its profile have been extracted.

Best Wishes.

Henry
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```