[swift-evolution] [Pitch] Add the DefaultConstructible protocol to the standard library

Dave Abrahams dabrahams at apple.com
Mon Dec 26 11:33:16 CST 2016

on Mon Dec 26 2016, Tim Vermeulen <swift-evolution at swift.org> wrote:

> I’ve never seen anyone use the empty init for it before, and if I ever
> will, I’ll probably discourage it. What is it for, anyways? Isn’t
> `Int.allZeros` enough?

Well, that interface has to do with Int's role as a
BitwiseOperationsType, and is going away (see

>> On 26 Dec 2016, at 18:09, David Sweeris <davesweeris at mac.com> wrote:
>>> On Dec 26, 2016, at 09:01, Tim Vermeulen via swift-evolution <swift-evolution at swift.org> wrote:
>>> Then why is Int() allowed, and why does that return 0?
>> Predictability, I'd guess. The memory has to be initialized to
>> *something*. And, IIRC, some architectures can 0 out memory faster
>> than filling it with some other pattern.
>> - Dave Sweeris
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