Closures without VA-stuff

["Jonathan Schmidt-Dominé - Developer" <devel at the-user dot org>]

Hi!

I am seeking a library providing a very simple feature like this:
int test(void *d, int x);
int main()
{
  struct data
  {
    int a, b;
  };
  data d;
  int(*fun)(int) = create_closure(test, &d);
  fun(4); // invokes test(d, 4)
}
So I have found two libraries: ffcall and libffi.
Such things are possible with libffi (and even ffcall), but there is no way to 
do simply that, you always need this "varaidic stuff". Why isn't there any 
simple function to create closures? Any suggestions what I should try to do?
I am asking you, because libffi looks promising. ;)

Jonathan

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