I think this is the same proposal as this rejected proposal:
https://github.com/apple/swift-evolution/blob/master/proposals/0024-optional-value-setter.md
<https://github.com/apple/swift-evolution/blob/master/proposals/0024-optional-value-setter.md>
> Le 25 janv. 2017 à 08:56, Sean Heber via swift-evolution
> <swift-evolution@swift.org> a écrit :
>
> Seems trivial to do this now:
>
> var foo = someOptional ?? foo
>
> Unless I’m not understanding?
>
> l8r
> Sean
>
>
>> On Jan 25, 2017, at 10:40 AM, Nichi Shin via swift-evolution
>> <swift-evolution@swift.org> wrote:
>>
>> I’d like to propose a new operator for optional assignment in Swift.
>>
>> The idea is that by using this operator (e.g. by doing a ?= b), the optional
>> on the right would be assigned to the variable on the left only when it has
>> something to assign (i.e. when it's not nil).
>>
>> The implementation could be something as follows:
>>
>> /// Optional Assignment Operator
>> infix operator ?=: AssignmentPrecedence
>>
>> func ?=<T>(left: inout T, right: T?) {
>> if right != nil {
>> left = right!
>> }
>> }
>>
>> func ?=<T>(left: inout T?, right: T?) {
>> if right != nil {
>> left = right
>> }
>> }
>>
>> I hope you will consider adding this on a future release of this great
>> programming language.
>>
>> Kind regards,
>> N. S.
>> _______________________________________________
>> swift-evolution mailing list
>> swift-evolution@swift.org
>> https://lists.swift.org/mailman/listinfo/swift-evolution
>
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