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46 lines
1.0 KiB
Markdown
46 lines
1.0 KiB
Markdown
# Array::begin() / end()
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```cpp
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Iterator begin();
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Iterator end();
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ConstIterator begin() const;
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ConstIterator end() const;
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```
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获取数组的迭代器,用于范围遍历。
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**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()`。
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**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。
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**迭代器类型:** `Iterator = T*`(原始指针),因此支持指针算术运算。
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**复杂度:** O(1)
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**线程安全:** ❌ 迭代期间不可并发修改数组
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**示例:**
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```cpp
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Containers::Array<int> arr = {10, 20, 30, 40, 50};
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// 范围 for 循环(推荐)
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for (int val : arr) {
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printf("%d\n", val);
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}
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// 手动迭代器
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for (auto it = arr.begin(); it != arr.end(); ++it) {
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printf("%d\n", *it);
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}
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// 指针算术(因为迭代器就是指针)
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int* ptr = arr.begin();
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ptr += 2; // 指向第三个元素
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*ptr; // 30
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```
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## 相关文档
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- [Array 总览](array.md) - 返回类总览
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