I want to insert elements that exist in container `A` to container `B` in a way that is equivalent to the following:

```
auto iter = /* iterator from somewhere in A */
for (auto i=0; i<N && iter++ != A.cend(); i++)
    B.push_back(*iter);

```

But using insert instead and no for loop, something like this;

```
B.insert(B.end(), iter, iter + N);

```