C++能不能输出迭代器保存的地址？

Question

比如有如下代码：

vector<int>::iterator tmp = find(box.begin(), box.end(), 0);

我想知道tmp保存的地址是多少，应该怎么做呢？

Answer 1

Generally speaking, an iterator is a data structure that stores the real data address in an internal member variable and overloads various operators (such as the dereference operator *). To obtain the data address, the recommended method is &*, that is, first obtain the real data through the asterisk operator which may be overloaded by and then obtain the address.

But for vector<int>, it is actually typedef int *iterator, so even (int*)tmp is no problem.

You can refer to "STL Source Code Analysis" translated by Hou Jie

Answer 2

&*tmp is enough, or std::addressof(*tmp)