Why doesn#39;t the program crash when I call a member function through a null pointer in C++?(为什么在C++中通过空指针调
Can I use NULL as substitution for the value of 0?(我可以使用 NULL 代替 0 的值吗?)
Is there a null std::ostream implementation in C++ or libraries?(C++ 或库中是否有空 std::ostream 实现?)
error: ‘NULL’ was not declared in this scope(错误:未在此范围内声明“NULL)
In either C or C++, should I check pointer parameters against NULL/nullptr?(在 C 或 C++ 中,我应该根据 NULL/nullptr 检查