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XCSDD/docs/api/containers/array/size.md
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# Array::Size() / Capacity() / Empty()
```cpp
size_t Size() const;
size_t Capacity() const;
bool Empty() const;
```
获取数组的尺寸信息。
**Size()** 返回数组中的实际元素数量。
**Capacity()** 返回底层内存缓冲区能容纳的元素数量,不一定等于 `Size()`
**Empty()** 返回数组是否为空(`Size() == 0`)。等价于 `Size() == 0`,但更语义化。
**返回:**
- `Size()` - 元素数量
- `Capacity()` - 底层缓冲区容量
- `Empty()` - 是否为空
**复杂度:** O(1)
**示例:**
```cpp
Containers::Array<int> arr;
arr.Size(); // 0
arr.Capacity(); // 0
arr.Empty(); // true
arr.PushBack(1);
arr.PushBack(2);
arr.Size(); // 2
arr.Capacity(); // 4自动扩容
arr.Empty(); // false
arr.Reserve(100);
arr.Size(); // 2元素数量不变
arr.Capacity(); // 100容量增加
```
## 相关文档
- [Array 总览](array.md) - 返回类总览