哪种铸造技术更适合在C ++中从上层类转换为下层类 [英] Which casting technique is better for doing casting from upper class to lower class in C++

问题描述

我应该使用Dynamic_cast或reinterpret_cast ？请告诉我

解决方案

不要使用 reinterpret_cast code> static_cast 或 dynamic_cast 。如果你确定指针正是那个派生类对象使用 static_cast ，否则使用 dynamic_cast 需要基类是polymorhic），并检查结果，以确保指针确实是你想要的类。

i want to cast from upper class pointer to lower class i.e from the base class pointer to derived class pointer.

Should i use "Dynamic_cast" or "reinterpret_cast"? please advice me

解决方案

Don't use reinterpret_cast - either use static_cast or dynamic_cast. If you're sure that the pointer is to exactly that derived class object use static_cast, otherwise use dynamic_cast (that will require the base class to be polymorhic) and check the result to ensure that the pointer is indeed to the class you want.

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