On 07.07.2017 5:50, David Baraff via swift-users wrote:
I thought I read that tuples would finally be hashable in swift 4, allowing for
them to be used in dictionaries/sets, but now that i google for it, i find no
mention of it.
are there any plans? so often i just want to quickly create a dictionary set
from a tuple of an integer or string or two, and not being able to do so is
just plain annoying.
Here what I can find regarding your question:
https://lists.swift.org/pipermail/swift-evolution/Week-of-Mon-20170313/033858.html
--- quote ---
...
> Btw, what is your opinion, can we expect (at some point of time)
Equatable&Hashable for tuples?
> It is very handy to have Dictionary<Tuple<type1,type2>, type3> in C# and sad that
we can't have [(type1,type2):type3] in Swift without declaration of new temporary
struct type and implement Equatable&Hashable for it.
It would be reasonable, IMO, even before we support the full generalization of
extensions on non-nominal types, to make tuples of Equatable/Hashable/Comparable
elements conform to the same protocols by fiat.
-Joe
--- quote ---
So... it seems like we all (including core team) want this, but this will not be
implemented in Swift4, as I understand.
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