Comparable+Clamp.swift

extension Comparable {
    mutating func clamp(_ limits: ClosedRange<Self>) {
        self = min(max(self, limits.lowerBound), limits.upperBound)
    }
    mutating func clamp(_ limits: PartialRangeFrom<Self>) {
        self = max(self, limits.lowerBound)
    }
    mutating func clamp(_ limits: PartialRangeThrough<Self>) {
        self = min(self, limits.upperBound)
    }
    func clamped(_ limits: ClosedRange<Self>) -> Self {
        var value = self
        value.clamp(limits)
        return value
    }
    func clamped(_ limits: PartialRangeFrom<Self>) -> Self {
        var value = self
        value.clamp(limits)
        return value
    }
    func clamped(_ limits: PartialRangeThrough<Self>) -> Self {
        var value = self
        value.clamp(limits)
        return value
    }

}

let value = 25
value.clamped(10...20)
value.clamped(10...)
value.clamped(...20)