变长数组 [英] Variable Length Array

问题描述

我想知道如何可变长度数组管理（保存在栈上才能有变长数组哪些额外的变量或数据结构）。

I would like to know how a variable length array is managed (what extra variables or data structures are kept on the stack in order to have variable length arrays).

非常感谢。

推荐答案

这只是一个动态大小的数组（依赖于实现的，但最常见的堆栈上）。这是pretty很像的alloca 在旧时代，不同之处在于的sizeof 将返回的实际大小数组，这意味着数组的大小也必须存储在某个地方（实现相关的为好，但可能在栈上也是如此）。

It's just a dynamically sized array (implementation-dependent, but most commonly on the stack). It's pretty much like alloca in the old days, with the exception that sizeof will return the actual size of the array, which implies that the size of the array must also be stored somewhere (implementation-dependent as well, but probably on the stack too).

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