c++ - 在 C++ 中使用 NULL？

Question

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Possible Duplicate:
Do you use NULL or 0 (zero) for pointers in C++?

在 C++ 中使用 NULL 还是只使用值 0 是个好主意？

在从 C++ 调用的 C 代码中使用 NULL 是否有特殊情况？喜欢 SDL？

Answer 1

在 C++ 中，NULL 扩展为 0 或 0L。看到这个quote from Stroustrup's FAQ :

Should I use NULL or 0?

In C++, the definition of NULL is 0, so there is only an aesthetic difference. I prefer to avoid macros, so I use 0. Another problem with NULL is that people sometimes mistakenly believe that it is different from 0 and/or not an integer. In pre-standard code, NULL was/is sometimes defined to something unsuitable and therefore had/has to be avoided. That's less common these days.

If you have to name the null pointer, call it nullptr; that's what it's called in C++11. Then, "nullptr" will be a keyword.