Swift:如何向memcpy添加偏移量(...)

Question

如何为memcpy(...)调用添加数组的偏移量？

我有一些数组String:

var source = ["a","b","c","d"]
var dest = [String](count:n, repeatedValue: "")
memcpy(&dest, source, UInt(2 * sizeof(String))

这个副本["a","b"]到dest.很明显.我如何复制["b","c"]？

Answer 1

不要在对象上使用memcpy或其他低级"C"运算符.这不会有很多原因.

使用切片运算符:

var source = ["a","b","c","d"]
var dest = Array(source[1...2])
println("dest: \(dest)")

输出:

dest:[b,c]

Unicode处理正确:

var source = ["", "", "a","b","c","d"]
var dest = Array(source[1...2])
println("dest: \(dest)")

输出:

dest:[,a]