[swift-users] ambiguous minus operator

[Rien]

I don’t know about the candidates

But the uptimeNanoseconds is a UInt64 and as such you should probably use substractWithOverflow.

var a: UInt64 = 12
var b: UInt64 = 25

let result = UInt64.subtractWithOverflow(a, b)

if result.overflow {
    print("Overflow")
} else {
    let answer = result.0
}

Regards,
Rien

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> On 16 Feb 2017, at 16:56, J.E. Schotsman via swift-users <swift-users at swift.org> wrote:
> 
> Hello,
> 
> I am trying to define an operator that subtracts dispatch times:
> 
> #import Dispatch
> 
> func -( time1: DispatchTime, time2: DispatchTime ) -> DispatchTimeInterval
> 	{
> 	return DispatchTimeInterval.nanoseconds( time2.uptimeNanoseconds - time1.uptimeNanoseconds )
> 	}
> 
> Compiler says: Ambiguous use of operator ‘-'
> Found this candidate
> Found this candidate
> 
> As usual the candidates are unknown.
> 
> What am I doing wrong?
> 
> Jan E.
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