是否有一个相当于 NullPointerException 的 C++ [英] Is there a C++ equivalent of a NullPointerException

问题描述

Java 和 C#，可能还有许多其他语言，都有一个预定义的异常类，当在不应该使用的地方使用空参数时会抛出该异常类.C ++中有类似的东西吗?如果没有，我可以使用其他预定义的异常还是应该定义自己的异常?

解决方案

取消引用 NULL 指针是 C++ 中的未定义行为 - 这意味着代码看起来可以工作.不保证会抛出异常.您可以使用

std::invalid_argument

异常(为其提供一个有意义的值 - p 为 NULL")，但您必须自己进行检查.

Both Java and C#, and probably many other languages too, have a predefined exception class that is thrown when a null parameter is used where it should not. Is there anything similar in C++? If not, is there another predefined exception I can use or should I define my own one?

解决方案

Dereferencing a NULL pointer is undefined behaviour in C++ - which means the code can appear to work. An exception isn't guaranteed to be thrown. You can use the

std::invalid_argument

exception (provide a meaningful value to it - "p is NULL"), but you'll have to do the check yourself.

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