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Swift 学习之数组（unshare）
import Foundation
println("Hello, World!")
var arr = [1, 2, 3, 4]
var arr1 = arr // share the same elements and do not copy really
arr1.unshare() // really to copy at the time when call unshare method
println(arr1)
arr1[0] = 10
println(arr)
println(arr1)
arr[0] = 20
println(arr) // only one exists, so it is unshare automatically.
println(arr1)
最后更新：2017-04-03 07:57:11