# LinearAllocator::GetCapacity

```cpp
size_t GetCapacity() const;
```

返回分配器的总容量，即预分配缓冲区的大小。此值在构造时确定，之后保持不变。

**参数：** 无

**返回：** 总容量（字节数）

**复杂度：** O(1)

**示例：**

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

LinearAllocator allocator(1024 * 1024); // 1MB

size_t capacity = allocator.GetCapacity(); // 1048576

allocator.Allocate(512);
allocator.Allocate(256);

size_t used = allocator.GetUsedSize();   // 768
size_t remaining = allocator.GetCapacity() - allocator.GetUsedSize(); // 1047808
```

## 相关文档

- [LinearAllocator 总览](linear-allocator.md) - 返回类总览