On 03/28/2013 04:18 AM, deadalnix wrote:
On Wednesday, 27 March 2013 at 18:20:49 UTC, Andrei Alexandrescu wrote:
On 3/27/13 1:23 PM, Timon Gehr wrote:
- Function that never return are inferred void. I would have preferred
typeof(null) as void lead to many static and repetitive code for
nothing
when doing metaprograming.
I strongly disagree.
Ideally such function should return a "none" type, the bottom of the
hierarchy lattice. We don't have such, so returning typeof(null)
(which we do have) is the next best choice as it's just above bottom.
I thought that typeof(null) was that bottom type. What is the difference ?
There is a huge difference.
- typeof(null) is a subtype of all _class, interface and pointer_
types because they all _include_ its value, null.
- bottom is a subtype of _all_ types, because there is _no_ value of
type bottom.
Anyway, void isn't the right choice here and is a pain to work with.
typeof(null) would be worse.
