On 25.05.2012 10:50, Don Clugston wrote:
The current implementation of CTFE strictly enforces C pointer
semantics. One of the restrictions is that you cannot perform ordering
comparisons between unrelated pointers.
This is important for repeatability: if it was permitted, the results
would be arbitrary and might vary unpredictably with subtle changes in
the code, or change between compiler releases.
But, there's an interesting case from bug 7898: the 'inside' operation.
If p and q are pointers to the same array, then (r >= p && r <= q) is
true if r points inside that array, and false if it does not.
Isn't indexes just enough for this use case? It's not like pointer
iteration faster/better when you base, end pointer pair.
--
Dmitry Olshansky
