@discardableResult
func increment(number: inout Int) -> Int {
let old = number
number += 1
return old
}
var x = 10
increment(number: &x)
@inline(__always)
描述 内联函数,提高代码的执行效率
示例
@discardableResult
@inline(__always)
func increment(number: inout Int) -> Int {
let old = number
number += 1
return old
}
var x = 10
increment(number: &x)
@available
@available(*, deprecated, message: "Use `Element` instead.")
typealias E = Element