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.
