Wrapping an int should raise exception

[mcowlishaw]

Mike Cowlishaw expressed concerns about int/uint security in the numbers discussion page:

"I believe the unpleasant effects go away if a 'wrap' of an int during arithmetic becomes some type of exception or overflow. The performance cost is negligible (typically a single compare and test after an operation) – and the types could then become extendable (later) to user-defined integer ranges, which would be really handy."

Wiki location=> discussion:numbers

[jeffdyer]

WG says no exception. Assigning to Lars for further investigation.

[lth]

I think this has been resolved. Having removed "use int" and "use uint" there are no wrapping operators except in the uint32ops namespace, where there are functions that you have to call explicitly to get wrapping behavior.