[swift-evolution] Add a `clamp` function to Algorithm.swift

[David Sweeris]

> On Mar 9, 2017, at 5:37 PM, Nicholas Maccharoli via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Swift Evolution, 
> 
> Having a`clamp` function available in the standard library would complement `min` and `max` really well.
> 
> I mentioned this before when the discussion for Swift 4 was still in stage 1, but now that stage 2 has started I thought it might be worth while to bring up again.
> 
> Still needs some work, but here is the draft proposal I wrote previously
> 
> https://github.com/Nirma/swift-evolution/commit/a51c543a76e9a1021996fb4b617311a588e7f397 <https://github.com/Nirma/swift-evolution/commit/a51c543a76e9a1021996fb4b617311a588e7f397>
> 
> Basically it boils down to something like this.
> 
> public func clamp<T : Comparable>(value: T, _ lower: T, _ upper: T) -> T {
>   return max(lower, min(value, upper))
> }
> 
> 
> What does the community think?

IIRC, we’ve been avoiding top-level functions lately… What about as an extension on Range?
extension Range {
    func clamp(_ x: Bound) -> Bound {
        return max(lowerBound, min(x, upperBound))
    }
}

- Dave Sweeris
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