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XCSDD/docs/api/memory/linear-allocator/allocate.md
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# LinearAllocator::Allocate
```cpp
void* Allocate(size_t size, size_t alignment = 8) override;
```
在缓冲区的当前位置顺序分配内存。每次分配都会将内部偏移量向前推进(对齐后)。如果剩余空间不足,则分配失败返回 `nullptr`。默认对齐值为 8 字节。
**参数:**
- `size` - 请求的字节数
- `alignment` - 内存对齐要求,默认为 8 字节
**返回:** 分配成功返回已对齐的指针,失败返回 `nullptr`
**复杂度:** O(1)
**示例:**
```cpp
#include <XCEngine/Memory/LinearAllocator.h>
LinearAllocator allocator(1024);
// 分配 256 字节8 字节对齐)
void* ptr1 = allocator.Allocate(256);
// 分配 128 字节16 字节对齐)
void* ptr2 = allocator.Allocate(128, 16);
// 分配 64 字节(默认 8 字节对齐)
void* ptr3 = allocator.Allocate(64);
// 检查是否成功
if (!ptr1) {
// 分配失败,缓冲区已满
}
```
## 相关文档
- [LinearAllocator 总览](linear-allocator.md) - 返回类总览