[swift-evolution] Add clamp(value: Bound) -> Bound to ClosedInterval

[Dave Abrahams]

on Wed Feb 17 2016, Kevin Ballard <swift-evolution at swift.org> wrote:

> I'd like to see ClosedInterval gain a new method
>
>     /// Returns `value` clamped to `self`.
>     func clamp(value: Bound) -> Bound
>
> This can't go on HalfOpenInterval (and therefore can't go on
> IntervalType) because a half-open interval doesn't have a known
> largest-contained-value (and in fact it can be empty), but it's
> perfectly reasonable for ClosedInterval to have this.

It's well-defined when the value is an Index (has discreet values).  But
that whole protocol is probably not long for this world...
(https://github.com/apple/swift/blob/master/test/Prototypes/CollectionsMoveIndices.swift)

-- 
-Dave