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XCSDD/docs/api/memory/linear-allocator/reallocate.md
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# LinearAllocator::Reallocate
```cpp
void* Reallocate(void* ptr, size_t newSize) override;
```
线性分配器不支持重新分配。此方法始终返回 `nullptr`,原内存块保持不变。由于线性分配器的顺序分配特性,无法调整现有块的大小。
**参数:**
- `ptr` - 不被使用(始终返回 nullptr
- `newSize` - 不被使用(始终返回 nullptr
**返回:** 始终返回 `nullptr`
**复杂度:** O(1)
**示例:**
```cpp
#include <XCEngine/Memory/LinearAllocator.h>
LinearAllocator allocator(1024);
void* ptr1 = allocator.Allocate(128);
// Reallocate 不支持,始终返回 nullptr
void* ptr2 = allocator.Reallocate(ptr1, 256);
if (!ptr2) {
// 线性分配器不支持重新分配
// ptr1 仍然有效
}
```
## 相关文档
- [LinearAllocator 总览](linear-allocator.md) - 返回类总览