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
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# HashMap::Size / Empty
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```cpp
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size_t Size() const;
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bool Empty() const;
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```
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获取哈希表的元素数量或判断是否为空。
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**参数:** 无
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**返回:**
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- `Size()` - 返回元素数量
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- `Empty()` - 容器为空返回 `true`,否则返回 `false`
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**复杂度:** O(1)
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**示例:**
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```cpp
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XCEngine::Containers::HashMap<int, const char*> map;
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std::cout << "Empty: " << (map.Empty() ? "yes" : "no") << std::endl; // 输出 "yes"
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std::cout << "Size: " << map.Size() << std::endl; // 输出 0
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map.Insert(1, "one");
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map.Insert(2, "two");
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std::cout << "Empty: " << (map.Empty() ? "yes" : "no") << std::endl; // 输出 "no"
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std::cout << "Size: " << map.Size() << std::endl; // 输出 2
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```
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## 相关文档
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- [HashMap 总览](hashmap.md) - 返回类总览
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