From: Jim Freeze <jim@...>
Date: 2003-05-03T09:16:00+09:00
Subject: Re: SWIG on Solaris problem

On Saturday,  3 May 2003 at  6:49:12 +0900, Lyle Johnson wrote:
> 
>      extern int fact2(int *INPUT);
> 
>      %include typemaps.i
> 
> that it will define a number of useful typemaps for dealing with this 
> situation. You've already seen how to handle the case of a pointer 
> that's really an input. But what if your function was instead using that 
> argument as an output, e.g.
> 
>      void deepthought(int *answer) {
>          *answer = 42;
>      }
> 
> Here, 'answer' is obviously an output-only argument. So you'd use the 
> OUTPUT typemap from typemaps.i:
> 
>      %include typemaps.i
> 
>      void deepthought(int *OUTPUT);
> 
> When you call this function from Ruby, you don't pass it any arguments; 
> its outputs come to you as regular outputs should:
> 
>      the_answer = deepthought() # should return 42

What would happen if I defined several OUTPUT params.
Would I get an array back?

 
> Finally, for input-output arguments, use the INOUT typemap:
> 
>      /* example.c */
>      void triple(int *n) {
>          *n = (*n) * 3;
>      }
> 
>      /* example.i */
> 
>      %include typemaps.i
> 
>      void triple(int *INOUT);
> 
> And to call this function from Ruby:
> 
>      tripled_value = triple(5) # should return 15

What if the function already has a return value.
Can one use an OUTPUT or INOUT argument?
 

-- 
Jim Freeze
----------
They're only trying to make me LOOK paranoid!