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fix Casting Operators

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https://github.com/huihut/interview/issues/113
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huihut
2025-07-25 20:45:01 +08:00
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@@ -1102,7 +1102,7 @@ unique_ptr 是 C++11 才开始提供的类型，是一种在异常时可以帮
| 转换类型 | 安全性 | 示例 | | 转换类型 | 安全性 | 示例 |
|--------------------------|--------------|--------------------------| |--------------------------|--------------|--------------------------|
| 数值类型转 | ✅ 安全 | `float f=3.14; int i=static_cast<int>(f);` | | 数值类型转换 | ✅ 安全 | `float f=3.14; int i=static_cast<int>(f);` |
| 类向上转换 | ✅ 安全 | `Derived* d; Base* b=static_cast<Base*>(d);` | | 类向上转换 | ✅ 安全 | `Derived* d; Base* b=static_cast<Base*>(d);` |
| 类向下转换 | ⚠️ 不安全 | `Base* b=new Base; Derived* d=static_cast<Derived*>(b);` | | 类向下转换 | ⚠️ 不安全 | `Base* b=new Base; Derived* d=static_cast<Derived*>(b);` |
| 类不变转换 | ✅ 安全 | `MyClass* p; MyClass* same=static_cast<MyClass*>(p);` | | 类不变转换 | ✅ 安全 | `MyClass* p; MyClass* same=static_cast<MyClass*>(p);` |