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

[David Sweeris]

> On Dec 26, 2016, at 11:12, Tino Heth via swift-evolution <swift-evolution at swift.org> wrote:
> 
> There is an older discussion that is somewhat linked to this topic:
> "Removing the empty initialiser requirement from RangeReplaceableCollection"
> https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20160704/023642.html
> 
> Imho "DefaultConstructible" types can be very handy, but so far, it seems no one has presented a single use case that is important enough to justify the inclusion in the stdlib.
> On the other hand, I'm quite sure that there's much functionality in the stdlib that many people consider as superfluous…
> 
> I guess adding the protocol wouldn't have a big impact on size, so for for me, the question is "Does this protocol confuse users of Swift?", which I'd answer with "yes, possibly" (unless someone comes up with a name that is more intuitive).

"Identity", but, at least for many numeric types, you'd need a mechanism for specifying which one you mean.

- Dave Sweeris
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