# Rect::GetLeft

```cpp
float GetLeft() const
```

获取矩形左边界。

**返回：** `float` - 左边界坐标 (x)

**复杂度：** O(1)

**示例：**

```cpp
Rect rect(10.0f, 20.0f, 100.0f, 50.0f);
float left = rect.GetLeft();  // 10.0f
```