# PoolAllocator::GetFreeBlockCount

```cpp
size_t GetFreeBlockCount() const;
```

返回当前空闲块的的数量。每次 `Allocate` 成功后减 1，每次 `Free` 后加 1。

**参数：** 无

**返回：** 当前可分配的空闲块数量

**复杂度：** O(1)

**示例：**

```cpp
#include <XCEngine/Memory/PoolAllocator.h>

PoolAllocator pool(sizeof(int), 100);

size_t initial = pool.GetFreeBlockCount(); // 100

void* blocks[10];
for (int i = 0; i < 10; ++i) {
    blocks[i] = pool.Allocate();
}

size_t after = pool.GetFreeBlockCount(); // 90

for (int i = 0; i < 5; ++i) {
    pool.Free(blocks[i]);
}

size_t final = pool.GetFreeBlockCount(); // 95
```

## 相关文档

- [PoolAllocator 总览](pool-allocator.md) - 返回类总览