range-expression.swift

struct HTTPResponse {
    var statusCode: Int
}

extension HTTPResponse {
    func validateStatus<R>(in range: R) -> Bool where R: RangeExpression, R.Bound == Int {
        return range~=self.statusCode
    }
}

let http = HTTPResponse(statusCode: 200)

http.validateStatus(in: 200...) // PartialRangeFrom
http.validateStatus(in: 200...300) // ClosedRange
http.validateStatus(in: 200..<300) // Range
http.validateStatus(in: ...300) // PartialRangeThrough
http.validateStatus(in: ..<300) // PartialRangeUpTo