[swift-users] Changing precedence of / operator for my protocol?
howard.lovatt at gmail.com
Tue Nov 29 17:22:27 CST 2016
Why not define some other symbol so that you can get the precedence you
On 30 November 2016 at 09:28, Greg Parker via swift-users <
swift-users at swift.org> wrote:
> > On Nov 29, 2016, at 2:55 AM, Rick Mann via swift-users <
> swift-users at swift.org> wrote:
> > Working on dimensional analysis, I have some proof-of-concept code that
> seems to be working:
> > let n1 = kilogram * meter / second * second
> > ([(kg⋅m) / s]⋅s)
> > let n2 = kilogram * meter / (second * second)
> > [(kg⋅m) / (s⋅s)]
> > Note: () around unit products,  around unit quotients.
> > I'd like to adjust the precedence of operator * for my Unit protocol to
> be higher than /. Is that possible? It wasn't at all clear to me how to do
> that in Swift 3, or if can even be done at all.
> You can't. A Swift operator's precedence is the same for all types that
> implement that operator. Operators * and / cannot use the same precedence
> on Int but different precedence on Unit.
> You could try to change the precedence of * and / globally - they're
> defined like any other operator in stdlib/public/core/Policy.swift - but
> you'll break lots of other code that way.
> Greg Parker gparker at apple.com Runtime Wrangler
> swift-users mailing list
> swift-users at swift.org
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