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docs/api/memory/linear-allocator/set-marker.md

@@ -0,0 +1,41 @@
+# LinearAllocator::SetMarker
+
+```cpp
+void SetMarker(void* marker);
+```
+
+恢复到之前通过 `GetMarker` 获取的标记位置。所有在标记之后的分配都将被丢弃，内部偏移量重置为该标记位置。此方法不会释放内存，只是移动偏移量指针。
+
+**参数：**
+- `marker` - 通过 `GetMarker` 获取的标记指针
+
+**返回：** 无
+
+**复杂度：** O(1)
+
+**示例：**
+
+```cpp
+#include <XCEngine/Memory/LinearAllocator.h>
+
+LinearAllocator allocator(1024);
+
+// 基础数据
+void* base = allocator.Allocate(256);
+void* marker = allocator.GetMarker();
+
+// 可选的扩展数据
+void* ext1 = allocator.Allocate(64);
+void* ext2 = allocator.Allocate(128);
+
+// 决定不使用扩展数据，回滚
+allocator.SetMarker(marker);
+
+// 扩展数据内存已被回收
+// 可以重新分配其他数据
+void* new_data = allocator.Allocate(128);
+```
+
+## 相关文档
+
+- [LinearAllocator 总览](linear-allocator.md) - 返回类总览