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XCEngine/docs/api/containers/hashmap/iterator.md
ssdfasd a9f882f233 docs: 修正 API 文档准确性 (第二轮检查)
修复的问题:
- math: 修复 Quaternion::Normalize 链接错误
- containers: HashMap 迭代器示例使用不存在的 cbegin/cend,删除冗余构造函数声明
- core: RefCounted 析构函数访问级别修正 (protected)
- debug: LogLevelToString 示例返回值大小写修正
- memory: 修正 LinearAllocator::Reallocate 返回 nullptr,ProxyAllocator 统计描述,头文件路径 IAllocator.h -> Allocator.h
- resources: Texture::Create mipLevels 参数描述修正
- rhi: 修复多处链接错误,新增缺失的方法文档
- threading: TaskSystem 配置项未实现状态标注,Wait 方法空实现标注
2026-03-19 00:31:14 +08:00

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# HashMap::begin / end
```cpp
Iterator begin();
Iterator end();
ConstIterator begin() const;
ConstIterator end() const;
```
获取哈希表的迭代器。迭代器遍历所有桶中的元素。
**参数:**
**返回:** 返回指向第一个元素和末尾(最后一个元素之后)位置的迭代器。
**复杂度:** O(1)
**示例:**
```cpp
XCEngine::Containers::HashMap<int, const char*> map;
map.Insert(1, "one");
map.Insert(2, "two");
map.Insert(3, "three");
for (auto it = map.begin(); it != map.end(); ++it) {
std::cout << it->first << " -> " << it->second << std::endl;
}
// 输出顺序不确定,取决于哈希桶的内部布局
// 范围 for 循环(需要 C++20 或手动实现 begin/end
for (auto& [key, value] : map) {
std::cout << key << " -> " << value << std::endl;
}
// 常量迭代器
for (auto it = map.begin(); it != map.end(); ++it) {
std::cout << it->first << " -> " << it->second << std::endl;
}
```
## 相关文档
- [HashMap 总览](hashmap.md) - 返回类总览