用C ++进行转换 [英] Casting in C++

问题描述

嗨 dynamic_cast和typeid运算符强制转换之间有什么区别?

Hi What are the Differences between dynamic_cast and typeid operator cast?

推荐答案

好吧，typeid并没有强制转换任何内容.它只是让您找出对象的类型.

dynamic_cast有点聪明，它只能让您从派生类强制转换为其基类，或者从基类强制转换为其派生类(假设基类对象实际上是派生类的)

如果您实际上打算像这样进行投射:
MyClass a = (MyClass)SomeObject;


这样的转换几乎可以允许任何操作.

Google推荐给您的一些方便阅读的内容:

使用c ++的类型转换运算符 [演示动态类型转换 [

Well, typeid doesn''t really cast anything. It just lets you find out the type of an object.

dynamic_cast is a little bit clever, it will only let you cast from a derived class to its base class, or from a base class back to its derived class (assuming the base class object is actually of the derived class)

If you actually meant about casting like this:
MyClass a = (MyClass)SomeObject;


Then that kind of cast will pretty much allow anything.

Some handy things for you to read that google threw up:

Type casting operators in c++[^]
Demonstrating dynamic cast[^]

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