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XCSDD/docs/api/containers/hashmap/constructor.md
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# HashMap::HashMap
```cpp
HashMap();
explicit HashMap(size_t bucketCount, Memory::IAllocator* allocator = nullptr);
```
构造哈希表实例。
**参数:**
- `bucketCount` - 初始桶的数量,默认为 16。若传入 0则自动调整为 16。
- `allocator` - 内存分配器指针,默认为 `nullptr`(使用默认分配器)。
**返回:**
**复杂度:** O(bucketCount),需要初始化所有桶
**示例:**
```cpp
XCEngine::Containers::HashMap<int, const char*> map1;
XCEngine::Containers::HashMap<int, const char*> map2(32);
auto customAllocator = XCEngine::Memory::GetDefaultAllocator();
XCEngine::Containers::HashMap<int, const char*> map3(64, customAllocator);
```
## 相关文档
- [HashMap 总览](hashmap.md) - 返回类总览