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