> > I'm afraid this will break on plaforms where `sizeof (int) != sizeof 
> > (long)'.
>If it is still int, I could do a test in the C code and go through a C 
>array if (sizeof(int) != sizeof(void*))

Why not do something along the lines of:
#define Meta_Assert(expr) typedef int __META_ASSERT__[(expr)? 1 : -1];

and then simply asserting it runtime? Like:
  Meta_Assert( sizeof(int) = sizeof(void*) );
Of course if you DO want it to work with different sizes, a different
approach is wanted. But mostly thses kind of things are nice, as they check
at compile time that certain truths about the runtime are true.

-- 
Jere Sanisalo [xm@xmunkki.org] - http://www.xmunkki.org/

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