[swift-evolution] Proposal: Allow "flat" declaration of nested types

[Robert Widmann]

I think this is an interesting proposal, but I don't write enough extremely-nested code to know that it will do much more than save you some whitespace - as you say.  What situation have you run into specifically where this kind of code is both called-for and headache-inducing?

~Robert Widmann

2016/11/19 18:48、Alexander Doloz via swift-evolution <swift-evolution at swift.org> のメッセージ:

> Hello, Swift community!
> 
> Right now, when we declare nested types in Swift, we have to literally nest them:
> 
> // Swift 3
> struct A {
>    var a = 0
>    struct B {
>        var b = 0
>        struct C {
>            var c = 0
>            func someFunc() {
>                if something {
> 
>                }
>            }
>        }
>    }
> }
> 
> By nesting types this way we waste amount of indents we can do without losing readability. In the example above, code inside if statement will already be far away from left border. 
> I propose to allow do nested types like this:
> 
> // Proposal
> struct A {
>    var a = 0
> }
> 
> struct A.B {
>    var b = 0
> }
> 
> struct A.B.C {
>    var c = 0
>    func someFunc() {
>        if something {
> 
>        }
>    }
> }
> 
> No more unnecessary indentation. 
> Of course, the old way should also continue to work. 
> 
> 
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