# RectInt::GetLeft

```cpp
int32_t GetLeft() const
```

获取矩形左边界。

**返回：** `int32_t` - 左边界坐标 (x)

**复杂度：** O(1)

**示例：**

```cpp
RectInt rect(10, 20, 100, 50);
int32_t left = rect.GetLeft();  // 10
```