28 lines
475 B
Markdown
28 lines
475 B
Markdown
|
# Matrix3::operator[]
|
|||
|
|
|
|||
|
|
```cpp
|
|||
|
|
float* operator[](int row)
|
|||
|
|
const float* operator[](int row) const
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
访问矩阵指定行的元素。
|
|||
|
|
|
|||
|
|
**参数：**
|
|||
|
|
- `row` - 行索引（0-2）
|
|||
|
|
|
|||
|
|
**返回：** `float*` / `const float*` - 指向该行首元素的指针
|
|||
|
|
|
|||
|
|
**复杂度：** O(1)
|
|||
|
|
|
|||
|
|
**示例：**
|
|||
|
|
|
|||
|
|
```cpp
|
|||
|
|
Matrix3 m;
|
|||
|
|
m[0][0] = 1; m[0][1] = 2; m[0][2] = 3;
|
|||
|
|
m[1][0] = 4; m[1][1] = 5; m[1][2] = 6;
|
|||
|
|
m[2][0] = 7; m[2][1] = 8; m[2][2] = 9;
|
|||
|
|
|
|||
|
|
// 访问元素
|
|||
|
|
float val = m[1][2]; // 6
|
|||
|
|
```
|