[swift-evolution] Optional Assignment Operator

[Psycho Hedgehog]

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 at 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 at 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 at swift.org
>> https://lists.swift.org/mailman/listinfo/swift-evolution
> 
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