# String::Clear

```cpp
void Clear();
```

清空字符串内容，将长度设为 0，但不释放已分配的内存。

**参数：** 无

**返回：** 无

**复杂度：** O(1)

**示例：**
```cpp
#include "XCEngine/Core/Containers/String.h"
#include <iostream>

int main() {
    XCEngine::Containers::String s("Hello World");
    std::cout << "Before clear - Length: " << s.Length()
              << ", Capacity: " << s.Capacity() << std::endl;
    // 输出: Before clear - Length: 11, Capacity: 12

    s.Clear();
    std::cout << "After clear - Length: " << s.Length()
              << ", Capacity: " << s.Capacity() << std::endl;
    // 输出: After clear - Length: 0, Capacity: 12
    std::cout << "Empty: " << s.Empty() << std::endl;  // 输出: Empty: 1

    return 0;
}
```

## 相关文档

- [String 总览](string.md) - 返回类总览
- [Reserve / Resize](reserve-resize.md) - 内存管理