[swift-users] operators and external parameters

[Ben Cohen]

Dunno about good form, but the std lib universally employs the _-less variant if that helps:

https://github.com/apple/swift/blob/master/stdlib/public/core/Character.swift#L404

The _ certainly seem like clutter to me.

Same for subscripts, which have similar behavior.

> On Jan 24, 2017, at 10:14 AM, Ray Fix via swift-users <swift-users at swift.org> wrote:
> 
> 
> When defining an operator such as == you can implicitly specify external parameters:
> 
> struct Path: Equatable {
>     var value: String
> 
>     static func ==(lhs: Path, rhs: Path) -> Bool {
>         return lhs.value == rhs.value
>     }
> }
> 
> Is this considered okay, or is it bad form and it should really be defined:
> 
> 
> struct Path: Equatable {
>     var value: String
> 
>     static func ==(_ lhs: Path, _ rhs: Path) -> Bool {
>         return lhs.value == rhs.value
>     }
> }
> 
> Both seem to work fine in practice… 🤔  
> 
> Thank you!
> Ray
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