斯威夫特：怎么加偏移的memcpy（...） [英] Swift: how add offset to memcpy(...)

问题描述

如何增加抵消阵列的memcpy（...）调用？

How to add offset for array for memcpy(...) invocation?

我字符串的数组：

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

此副本[A，B]到dest。很明显。
我怎样才能复制[B，C]

This copy ["a","b"] to dest. I'ts obvious. How can i copy ["b", "c"] ?

推荐答案

不要在对象使用的memcpy或其他低级别C的运营商。这不会的原因很​​多工作。

Do not use memcpy or other low-level "C" operators on objects. That will not work for many reasons.

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]

dest: [b, c]

统一code是正确处理：

Unicode is handled correctly:

这篇关于斯威夫特：怎么加偏移的memcpy（...）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！