[swift-evolution] Proposal: Tuple Convertible

[Stephen Celis]

Do you mean a TupleLiteralConvertible? I’m also in favor of a ClosureLiteralConvertible (or FunctionLiteralConvertible).

Stephen

> On Dec 6, 2015, at 6:40 PM, Nikolai Vazquez via swift-evolution <swift-evolution at swift.org> wrote:
> 
> When working with points, I’ll sometimes make a typealias to an integer tuple:
> 
> typealias Point = (x: Int, y: Int)
> However, if I want to add extended functionality to my Point type, I would have to change it to a struct, removing the ability to create one on the fly with a tuple.
> 
> I’m proposing a TupleConvertible protocol that allows initialization from a tuple directly.
> 
> struct Point: TupleConvertible {
> 
>     var x, y: Int
> 
>     init(x: Int, y: Int) {
>         self.x = x
>         self.y = y
>     }
> 
>     init(tuple: (x: Int, y: Int)) {
>         self.init(x: tuple.x, y: tuple.y)
>     }
> 
> }
> This would make it very easy to create new Point instances.
> 
> let somePoint: Point = (50, 120)
> let otherPoint = Point(x: 50, y: 120)
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