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58a83f445a
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40 lines
891 B
Markdown
40 lines
891 B
Markdown
# HashMap::Find
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```cpp
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Value* Find(const Key& key);
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const Value* Find(const Key& key) const;
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```
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根据键查找对应的值指针。
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**参数：**
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- `key` - 要查找的键
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**返回：** 如果找到，返回指向值的指针；否则返回 `nullptr`。
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**复杂度：** O(1) 平均，最坏 O(n)（同一桶中有多个键发生哈希冲突）
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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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map.Insert(1, "one");
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map.Insert(2, "two");
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const char* value1 = map.Find(1);
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if (value1) {
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std::cout << "Found: " << value1 << std::endl; // 输出 "Found: one"
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}
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const char* value2 = map.Find(99);
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if (!value2) {
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std::cout << "Not found" << std::endl; // 输出 "Not found"
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}
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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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- [Contains](contains.md) - 检查是否包含键
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- [operator[]](./operator-subscript.md) - 下标访问
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