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39 lines
812 B
Markdown
39 lines
812 B
Markdown
# Array::Front() / Back()
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```cpp
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T& Front();
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const T& Front() const;
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T& Back();
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const T& Back() const;
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```
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获取数组首尾元素的引用。
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**Front()：** 返回第一个元素（`index == 0`）的引用。
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**Back()：** 返回最后一个元素（`index == Size() - 1`）的引用。
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**前置条件：** 数组必须非空，否则行为未定义。
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**返回：** 首/尾元素的引用
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**复杂度：** O(1)
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**线程安全：** ❌ 访问期间不可并发修改
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**示例：**
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```cpp
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Containers::Array<int> arr = {10, 20, 30};
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int& first = arr.Front(); // first == 10
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int& last = arr.Back(); // last == 30
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arr.Front() = 5; // arr 现在是 {5, 20, 30}
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arr.Back() = 100; // arr 现在是 {5, 20, 100}
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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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