2026-03-20 02:35:15 +08:00
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# Matrix4x4::operator[]
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```cpp
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float* operator[](int row)
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const float* operator[](int row) const
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```
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通过行索引访问矩阵元素。返回指向该行第一列元素的指针。
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**参数：**
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- `row` - 行索引（0-3）
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**返回：** 指向该行数据的指针
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**线程安全：** ✅
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**复杂度：** O(1)
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**示例：**
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```cpp
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2026-03-26 02:41:00 +08:00
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#include "XCEngine/Core/Math/Matrix4.h"
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2026-03-20 02:35:15 +08:00
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using namespace XCEngine::Math;
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Matrix4 m = Matrix4::Identity();
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m[0][0] = 5.0f; // 设置第一行第一列
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m[1][2] = 3.0f; // 设置第二行第三列
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float val = m[0][1]; // 读取第一行第二列
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```
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## 相关文档
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- [Matrix4](matrix4.md) - 返回类总览
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