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XCSDD/docs/api/containers/array/iterator.md
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# Array::begin() / end()
```cpp
Iterator begin();
Iterator end();
ConstIterator begin() const;
ConstIterator end() const;
```
获取数组的迭代器,用于范围遍历。
**begin()** 返回指向第一个元素的迭代器。如果数组为空,返回值等于 `end()`
**end()** 返回指向"最后一个元素之后"位置的迭代器(哨兵)。这是一个越界位置,不可解引用。
**迭代器类型:** `Iterator = T*`(原始指针),因此支持指针算术运算。
**复杂度:** O(1)
**线程安全:** ❌ 迭代期间不可并发修改数组
**示例:**
```cpp
Containers::Array<int> arr = {10, 20, 30, 40, 50};
// 范围 for 循环(推荐)
for (int val : arr) {
printf("%d\n", val);
}
// 手动迭代器
for (auto it = arr.begin(); it != arr.end(); ++it) {
printf("%d\n", *it);
}
// 指针算术(因为迭代器就是指针)
int* ptr = arr.begin();
ptr += 2; // 指向第三个元素
*ptr; // 30
```
## 相关文档
- [Array 总览](array.md) - 返回类总览