Re: Determining number of return values expected

[Leopold Toetsch]

On Oct 24, 2005, at 0:07, Jonathan Worthington wrote:
"Leopold Toetsch" <[EMAIL PROTECTED]> wrote:

op result_count(out INT)        # TODO or some such

I'm guessing TODO means "it's not done yet"?  But I was wondering, 
would a more general solution not be to have an op that hands back the 
results PMC constant that specifies the types as well as number of 
return values, then you can just call the elements vtable function for 
that PMC to get the number of arguments, plus other info is available 
too, and we just have the one new op?

Yep. That's the more general solution:

op result_info(out PMC) {
  PMC *i;
  if (PMC_IS_NULL(i = CONTEXT(interpreter->ctx)->current_results))
    $1 = pmc_new(interpreter, enum_class_FixedIntegerArray); /* 0 elems 
aka void */
  else
    $1 = i;
  goto NEXT();
 }

# untested ;-)

Either way, I should have time to look at putting an op to do 
something like this in soon, if leo or @other don't beat me to it. ;-)

Drop something like above into experimental.ops and let's see, how it 
works.

Jonathan

leo