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XCEngine/docs/api/containers/hashmap/iterator.md
ssdfasd dc850d7739 docs: 重构 API 文档结构并修正源码准确性
- 重组文档目录结构: 每个模块的概述页移动到模块子目录
- 重命名 index.md 为 main.md
- 修正所有模块文档中的错误:
  - math: FromEuler→FromEulerAngles, TransformDirection 包含缩放, Box 是 OBB, Color::ToRGBA 格式
  - containers: 新增 operator==/!= 文档, 补充 std::hash DJB 算法细节
  - core: 修复 types 链接错误
  - debug: LogLevelToString 返回大写, timestamp 是秒, Profiler 空实现标注, Windows API vs ANSI
  - memory: 修复头文件路径, malloc vs operator new, 新增方法文档
  - resources: 修复 Shader/Texture 链接错误
  - threading: TaskSystem::Wait 空实现标注, ReadWriteLock 重入描述, LambdaTask 链接
- 验证: fix_links.py 确认 0 个断裂引用
2026-03-19 00:22:30 +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.cbegin(); it != map.cend(); ++it) {
std::cout << it->first << " -> " << it->second << std::endl;
}
```
## 相关文档
- [HashMap 总览](hashmap.md) - 返回类总览