45 lines
1.2 KiB
Markdown
45 lines
1.2 KiB
Markdown
|
# PoolAllocator::PoolAllocator / ~PoolAllocator
|
|||
|
|
|
|||
|
|
```cpp
|
|||
|
|
PoolAllocator(size_t blockSize, size_t poolSize, size_t alignment = 8);
|
|||
|
|
~PoolAllocator() override;
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
构造内存池分配器，预分配 `poolSize` 个大小为 `blockSize` 字节的内存块。内存块按 `alignment` 对齐（默认 8 字节）。内部维护一个空闲块链表来管理分配。析构函数释放整个内存池。
|
|||
|
|
|
|||
|
|
**参数：**
|
|||
|
|
- `blockSize` - 每个内存块的大小（字节）
|
|||
|
|
- `poolSize` - 内存池中总块数
|
|||
|
|
- `alignment` - 对齐要求，默认为 8
|
|||
|
|
|
|||
|
|
**返回：** 无
|
|||
|
|
|
|||
|
|
**复杂度：** O(n)，需要预分配所有块
|
|||
|
|
|
|||
|
|
**示例：**
|
|||
|
|
|
|||
|
|
```cpp
|
|||
|
|
#include <XCEngine/Memory/PoolAllocator.h>
|
|||
|
|
|
|||
|
|
struct Particle {
|
|||
|
|
float x, y, z;
|
|||
|
|
float vx, vy, vz;
|
|||
|
|
float life;
|
|||
|
|
};
|
|||
|
|
|
|||
|
|
// 创建一个能容纳 1000 个 Particle 的内存池，16 字节对齐
|
|||
|
|
PoolAllocator pool(sizeof(Particle), 1000, alignof(Particle));
|
|||
|
|
|
|||
|
|
size_t blockSize = pool.GetBlockSize(); // sizeof(Particle)
|
|||
|
|
size_t total = pool.GetTotalBlockCount(); // 1000
|
|||
|
|
size_t free = pool.GetFreeBlockCount(); // 1000
|
|||
|
|
|
|||
|
|
// 分配和释放
|
|||
|
|
void* block = pool.Allocate();
|
|||
|
|
pool.Free(block);
|
|||
|
|
```
|
|||
|
|
|
|||
|
|
## 相关文档
|
|||
|
|
|
|||
|
|
- [PoolAllocator 总览](pool-allocator.md) - 返回类总览
|