Andy Lester wrote:
What about when you want to implement things like, element -1 gets the
last element of the array? That's the case in some languages, I
believe...
Yes, but we're talking about returning the number of elements in a PMC.
That should never be negative.
Unless someone wants to write a PMC that does return a negative number
for VTABLE_elements and have that number be significant in some way.
The vtable functions define a standard interface for all PMCs and they
use a standard set of types: INTVAL, FLOATVAL, STRING*, and PMC*. These,
unsurprisingly, directly correspond to the register types. That's an
intentional part of the design.
Allison
