Re: Passing a long C type by a handle

Christian Cleber Masdeval Braz - DATAPREVMS wrote:
> 
>   Hi,
>  
>      i need to pass a long C type variable to the is/2 predicate. I make 
> the method table whose set method is
>    
>      int set(t_ext_ptr obj, int idx, pword data)
>     {
>         long x;
>         EC_word y(data).
>         y.is_long(&x);
>         *((long*)obj) = x;
>        
>         return 0;
>     }
>  
>     Then i submit the following goal
>  
>     long x;
>     post_goal(term(EC_functor("is",2)handle(&ec_xt_long,&x),20));
>  
>     EC_resume();
>  
>     cout << x;
>  
>     What i expect is the assign of 20 to the C variable, but the error
>  
>        " type error in  is 20 in module eclipse'
>  
>     is occurring.


The left hand side of is/2 cannot be a handle, it must be a variable or a number.

The only way to invoke the set-method from Eclipse code is via the xset/3 or
the setarg/3 builtin.



-- 
  Joachim Schimpf              /             phone: +44 20 7594 8187
  IC-Parc                     /      mailto:J.Schimpf@imperial.ac.uk
  Imperial College London    /    http://www.icparc.ic.ac.uk/eclipse