Assign value of one iterator into another iterator C++

Question

Say I have an iterator it which is pointing to some element of map.
Also I have another iterator it1 , and I want to do something like this

it1 = it + 1;  

How can we achieve this in C++ as above statement gives error in C++.

Answer 1

In C++11, you say auto it1 = std::next(it, 1);.

Prior to that, you have to say something like:

std::map<K, T>::iterator it1 = it;
std::advance(it1, 1);

Don't forget to #include <iterator>.