[Issue 9286] std.conv.parse fails to compile with Nullable

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9286



--- Comment #10 from jens.k.mueller at gmx.de 2013-01-09 06:03:30 PST ---
(In reply to comment #9)
> > I believe the set of operations is unique. But I would need to try it out. Do
> > you happen to know of an example that supports the set of integral oprations
> > yet is no integral?
> 
> Floating point types support exactly the same set of operations as integral
> types but with slightly different semantics. So, there's no way to test a
> type's API for being an integral type without floating point types matching as
> well.

True. Floating point types shouldn't be counted as integral. Then let's check
for these semantics.
What about 1 / T.max == 0?
Admittedly this requires CTFE of your type.
You're right that you may also need to consider the semantics of the
operations.

> Also, would types like core.time.Duration or core.time.TickDuration count
> as integral types? Both of them support those operations, and yet I wouldn't
> consider them to be integral types.

No, since division must return a T. But a duration needs to loose its unit when
dividing.

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